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/wp-includes/ -> media.php (source)

   1  <?php
   2  /**
   3   * WordPress API for media display.
   4   *
   5   * @package WordPress
   6   * @subpackage Media
   7   */
   8  
   9  /**
  10   * Retrieve additional image sizes.
  11   *
  12   * @since 4.7.0
  13   *
  14   * @global array $_wp_additional_image_sizes
  15   *
  16   * @return array Additional images size data.
  17   */
  18  function wp_get_additional_image_sizes() {
  19      global $_wp_additional_image_sizes;
  20  
  21      if ( ! $_wp_additional_image_sizes ) {
  22          $_wp_additional_image_sizes = array();
  23      }
  24  
  25      return $_wp_additional_image_sizes;
  26  }
  27  
  28  /**
  29   * Scale down the default size of an image.
  30   *
  31   * This is so that the image is a better fit for the editor and theme.
  32   *
  33   * The `$size` parameter accepts either an array or a string. The supported string
  34   * values are 'thumb' or 'thumbnail' for the given thumbnail size or defaults at
  35   * 128 width and 96 height in pixels. Also supported for the string value is
  36   * 'medium', 'medium_large' and 'full'. The 'full' isn't actually supported, but any value other
  37   * than the supported will result in the content_width size or 500 if that is
  38   * not set.
  39   *
  40   * Finally, there is a filter named {@see 'editor_max_image_size'}, that will be
  41   * called on the calculated array for width and height, respectively.
  42   *
  43   * @since 2.5.0
  44   *
  45   * @global int $content_width
  46   *
  47   * @param int          $width   Width of the image in pixels.
  48   * @param int          $height  Height of the image in pixels.
  49   * @param string|int[] $size    Optional. Image size. Accepts any registered image size name, or an array
  50   *                              of width and height values in pixels (in that order). Default 'medium'.
  51   * @param string       $context Optional. Could be 'display' (like in a theme) or 'edit'
  52   *                              (like inserting into an editor). Default null.
  53   * @return int[] {
  54   *     An array of width and height values.
  55   *
  56   *     @type int $0 The maximum width in pixels.
  57   *     @type int $1 The maximum height in pixels.
  58   * }
  59   */
  60  function image_constrain_size_for_editor( $width, $height, $size = 'medium', $context = null ) {
  61      global $content_width;
  62  
  63      $_wp_additional_image_sizes = wp_get_additional_image_sizes();
  64  
  65      if ( ! $context ) {
  66          $context = is_admin() ? 'edit' : 'display';
  67      }
  68  
  69      if ( is_array( $size ) ) {
  70          $max_width  = $size[0];
  71          $max_height = $size[1];
  72      } elseif ( 'thumb' === $size || 'thumbnail' === $size ) {
  73          $max_width  = (int) get_option( 'thumbnail_size_w' );
  74          $max_height = (int) get_option( 'thumbnail_size_h' );
  75          // Last chance thumbnail size defaults.
  76          if ( ! $max_width && ! $max_height ) {
  77              $max_width  = 128;
  78              $max_height = 96;
  79          }
  80      } elseif ( 'medium' === $size ) {
  81          $max_width  = (int) get_option( 'medium_size_w' );
  82          $max_height = (int) get_option( 'medium_size_h' );
  83  
  84      } elseif ( 'medium_large' === $size ) {
  85          $max_width  = (int) get_option( 'medium_large_size_w' );
  86          $max_height = (int) get_option( 'medium_large_size_h' );
  87  
  88          if ( (int) $content_width > 0 ) {
  89              $max_width = min( (int) $content_width, $max_width );
  90          }
  91      } elseif ( 'large' === $size ) {
  92          /*
  93           * We're inserting a large size image into the editor. If it's a really
  94           * big image we'll scale it down to fit reasonably within the editor
  95           * itself, and within the theme's content width if it's known. The user
  96           * can resize it in the editor if they wish.
  97           */
  98          $max_width  = (int) get_option( 'large_size_w' );
  99          $max_height = (int) get_option( 'large_size_h' );
 100  
 101          if ( (int) $content_width > 0 ) {
 102              $max_width = min( (int) $content_width, $max_width );
 103          }
 104      } elseif ( ! empty( $_wp_additional_image_sizes ) && in_array( $size, array_keys( $_wp_additional_image_sizes ), true ) ) {
 105          $max_width  = (int) $_wp_additional_image_sizes[ $size ]['width'];
 106          $max_height = (int) $_wp_additional_image_sizes[ $size ]['height'];
 107          // Only in admin. Assume that theme authors know what they're doing.
 108          if ( (int) $content_width > 0 && 'edit' === $context ) {
 109              $max_width = min( (int) $content_width, $max_width );
 110          }
 111      } else { // $size === 'full' has no constraint.
 112          $max_width  = $width;
 113          $max_height = $height;
 114      }
 115  
 116      /**
 117       * Filters the maximum image size dimensions for the editor.
 118       *
 119       * @since 2.5.0
 120       *
 121       * @param int[]        $max_image_size {
 122       *     An array of width and height values.
 123       *
 124       *     @type int $0 The maximum width in pixels.
 125       *     @type int $1 The maximum height in pixels.
 126       * }
 127       * @param string|int[] $size     Requested image size. Can be any registered image size name, or
 128       *                               an array of width and height values in pixels (in that order).
 129       * @param string       $context  The context the image is being resized for.
 130       *                               Possible values are 'display' (like in a theme)
 131       *                               or 'edit' (like inserting into an editor).
 132       */
 133      list( $max_width, $max_height ) = apply_filters( 'editor_max_image_size', array( $max_width, $max_height ), $size, $context );
 134  
 135      return wp_constrain_dimensions( $width, $height, $max_width, $max_height );
 136  }
 137  
 138  /**
 139   * Retrieve width and height attributes using given width and height values.
 140   *
 141   * Both attributes are required in the sense that both parameters must have a
 142   * value, but are optional in that if you set them to false or null, then they
 143   * will not be added to the returned string.
 144   *
 145   * You can set the value using a string, but it will only take numeric values.
 146   * If you wish to put 'px' after the numbers, then it will be stripped out of
 147   * the return.
 148   *
 149   * @since 2.5.0
 150   *
 151   * @param int|string $width  Image width in pixels.
 152   * @param int|string $height Image height in pixels.
 153   * @return string HTML attributes for width and, or height.
 154   */
 155  function image_hwstring( $width, $height ) {
 156      $out = '';
 157      if ( $width ) {
 158          $out .= 'width="' . (int) $width . '" ';
 159      }
 160      if ( $height ) {
 161          $out .= 'height="' . (int) $height . '" ';
 162      }
 163      return $out;
 164  }
 165  
 166  /**
 167   * Scale an image to fit a particular size (such as 'thumb' or 'medium').
 168   *
 169   * The URL might be the original image, or it might be a resized version. This
 170   * function won't create a new resized copy, it will just return an already
 171   * resized one if it exists.
 172   *
 173   * A plugin may use the {@see 'image_downsize'} filter to hook into and offer image
 174   * resizing services for images. The hook must return an array with the same
 175   * elements that are normally returned from the function.
 176   *
 177   * @since 2.5.0
 178   *
 179   * @param int          $id   Attachment ID for image.
 180   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
 181   *                           of width and height values in pixels (in that order). Default 'medium'.
 182   * @return array|false {
 183   *     Array of image data, or boolean false if no image is available.
 184   *
 185   *     @type string $0 Image source URL.
 186   *     @type int    $1 Image width in pixels.
 187   *     @type int    $2 Image height in pixels.
 188   *     @type bool   $3 Whether the image is a resized image.
 189   * }
 190   */
 191  function image_downsize( $id, $size = 'medium' ) {
 192      $is_image = wp_attachment_is_image( $id );
 193  
 194      /**
 195       * Filters whether to preempt the output of image_downsize().
 196       *
 197       * Returning a truthy value from the filter will effectively short-circuit
 198       * down-sizing the image, returning that value instead.
 199       *
 200       * @since 2.5.0
 201       *
 202       * @param bool|array   $downsize Whether to short-circuit the image downsize.
 203       * @param int          $id       Attachment ID for image.
 204       * @param string|int[] $size     Requested image size. Can be any registered image size name, or
 205       *                               an array of width and height values in pixels (in that order).
 206       */
 207      $out = apply_filters( 'image_downsize', false, $id, $size );
 208  
 209      if ( $out ) {
 210          return $out;
 211      }
 212  
 213      $img_url          = wp_get_attachment_url( $id );
 214      $meta             = wp_get_attachment_metadata( $id );
 215      $width            = 0;
 216      $height           = 0;
 217      $is_intermediate  = false;
 218      $img_url_basename = wp_basename( $img_url );
 219  
 220      // If the file isn't an image, attempt to replace its URL with a rendered image from its meta.
 221      // Otherwise, a non-image type could be returned.
 222      if ( ! $is_image ) {
 223          if ( ! empty( $meta['sizes']['full'] ) ) {
 224              $img_url          = str_replace( $img_url_basename, $meta['sizes']['full']['file'], $img_url );
 225              $img_url_basename = $meta['sizes']['full']['file'];
 226              $width            = $meta['sizes']['full']['width'];
 227              $height           = $meta['sizes']['full']['height'];
 228          } else {
 229              return false;
 230          }
 231      }
 232  
 233      // Try for a new style intermediate size.
 234      $intermediate = image_get_intermediate_size( $id, $size );
 235  
 236      if ( $intermediate ) {
 237          $img_url         = str_replace( $img_url_basename, $intermediate['file'], $img_url );
 238          $width           = $intermediate['width'];
 239          $height          = $intermediate['height'];
 240          $is_intermediate = true;
 241      } elseif ( 'thumbnail' === $size ) {
 242          // Fall back to the old thumbnail.
 243          $thumb_file = wp_get_attachment_thumb_file( $id );
 244          $info       = null;
 245  
 246          if ( $thumb_file ) {
 247              $info = wp_getimagesize( $thumb_file );
 248          }
 249  
 250          if ( $thumb_file && $info ) {
 251              $img_url         = str_replace( $img_url_basename, wp_basename( $thumb_file ), $img_url );
 252              $width           = $info[0];
 253              $height          = $info[1];
 254              $is_intermediate = true;
 255          }
 256      }
 257  
 258      if ( ! $width && ! $height && isset( $meta['width'], $meta['height'] ) ) {
 259          // Any other type: use the real image.
 260          $width  = $meta['width'];
 261          $height = $meta['height'];
 262      }
 263  
 264      if ( $img_url ) {
 265          // We have the actual image size, but might need to further constrain it if content_width is narrower.
 266          list( $width, $height ) = image_constrain_size_for_editor( $width, $height, $size );
 267  
 268          return array( $img_url, $width, $height, $is_intermediate );
 269      }
 270  
 271      return false;
 272  }
 273  
 274  /**
 275   * Register a new image size.
 276   *
 277   * @since 2.9.0
 278   *
 279   * @global array $_wp_additional_image_sizes Associative array of additional image sizes.
 280   *
 281   * @param string     $name   Image size identifier.
 282   * @param int        $width  Optional. Image width in pixels. Default 0.
 283   * @param int        $height Optional. Image height in pixels. Default 0.
 284   * @param bool|array $crop   Optional. Image cropping behavior. If false, the image will be scaled (default),
 285   *                           If true, image will be cropped to the specified dimensions using center positions.
 286   *                           If an array, the image will be cropped using the array to specify the crop location.
 287   *                           Array values must be in the format: array( x_crop_position, y_crop_position ) where:
 288   *                               - x_crop_position accepts: 'left', 'center', or 'right'.
 289   *                               - y_crop_position accepts: 'top', 'center', or 'bottom'.
 290   */
 291  function add_image_size( $name, $width = 0, $height = 0, $crop = false ) {
 292      global $_wp_additional_image_sizes;
 293  
 294      $_wp_additional_image_sizes[ $name ] = array(
 295          'width'  => absint( $width ),
 296          'height' => absint( $height ),
 297          'crop'   => $crop,
 298      );
 299  }
 300  
 301  /**
 302   * Check if an image size exists.
 303   *
 304   * @since 3.9.0
 305   *
 306   * @param string $name The image size to check.
 307   * @return bool True if the image size exists, false if not.
 308   */
 309  function has_image_size( $name ) {
 310      $sizes = wp_get_additional_image_sizes();
 311      return isset( $sizes[ $name ] );
 312  }
 313  
 314  /**
 315   * Remove a new image size.
 316   *
 317   * @since 3.9.0
 318   *
 319   * @global array $_wp_additional_image_sizes
 320   *
 321   * @param string $name The image size to remove.
 322   * @return bool True if the image size was successfully removed, false on failure.
 323   */
 324  function remove_image_size( $name ) {
 325      global $_wp_additional_image_sizes;
 326  
 327      if ( isset( $_wp_additional_image_sizes[ $name ] ) ) {
 328          unset( $_wp_additional_image_sizes[ $name ] );
 329          return true;
 330      }
 331  
 332      return false;
 333  }
 334  
 335  /**
 336   * Registers an image size for the post thumbnail.
 337   *
 338   * @since 2.9.0
 339   *
 340   * @see add_image_size() for details on cropping behavior.
 341   *
 342   * @param int        $width  Image width in pixels.
 343   * @param int        $height Image height in pixels.
 344   * @param bool|array $crop   Optional. Whether to crop images to specified width and height or resize.
 345   *                           An array can specify positioning of the crop area. Default false.
 346   */
 347  function set_post_thumbnail_size( $width = 0, $height = 0, $crop = false ) {
 348      add_image_size( 'post-thumbnail', $width, $height, $crop );
 349  }
 350  
 351  /**
 352   * Gets an img tag for an image attachment, scaling it down if requested.
 353   *
 354   * The {@see 'get_image_tag_class'} filter allows for changing the class name for the
 355   * image without having to use regular expressions on the HTML content. The
 356   * parameters are: what WordPress will use for the class, the Attachment ID,
 357   * image align value, and the size the image should be.
 358   *
 359   * The second filter, {@see 'get_image_tag'}, has the HTML content, which can then be
 360   * further manipulated by a plugin to change all attribute values and even HTML
 361   * content.
 362   *
 363   * @since 2.5.0
 364   *
 365   * @param int          $id    Attachment ID.
 366   * @param string       $alt   Image description for the alt attribute.
 367   * @param string       $title Image description for the title attribute.
 368   * @param string       $align Part of the class name for aligning the image.
 369   * @param string|int[] $size  Optional. Image size. Accepts any registered image size name, or an array of
 370   *                            width and height values in pixels (in that order). Default 'medium'.
 371   * @return string HTML IMG element for given image attachment
 372   */
 373  function get_image_tag( $id, $alt, $title, $align, $size = 'medium' ) {
 374  
 375      list( $img_src, $width, $height ) = image_downsize( $id, $size );
 376      $hwstring                         = image_hwstring( $width, $height );
 377  
 378      $title = $title ? 'title="' . esc_attr( $title ) . '" ' : '';
 379  
 380      $size_class = is_array( $size ) ? implode( 'x', $size ) : $size;
 381      $class      = 'align' . esc_attr( $align ) . ' size-' . esc_attr( $size_class ) . ' wp-image-' . $id;
 382  
 383      /**
 384       * Filters the value of the attachment's image tag class attribute.
 385       *
 386       * @since 2.6.0
 387       *
 388       * @param string       $class CSS class name or space-separated list of classes.
 389       * @param int          $id    Attachment ID.
 390       * @param string       $align Part of the class name for aligning the image.
 391       * @param string|int[] $size  Requested image size. Can be any registered image size name, or
 392       *                            an array of width and height values in pixels (in that order).
 393       */
 394      $class = apply_filters( 'get_image_tag_class', $class, $id, $align, $size );
 395  
 396      $html = '<img src="' . esc_url( $img_src ) . '" alt="' . esc_attr( $alt ) . '" ' . $title . $hwstring . 'class="' . $class . '" />';
 397  
 398      /**
 399       * Filters the HTML content for the image tag.
 400       *
 401       * @since 2.6.0
 402       *
 403       * @param string       $html  HTML content for the image.
 404       * @param int          $id    Attachment ID.
 405       * @param string       $alt   Image description for the alt attribute.
 406       * @param string       $title Image description for the title attribute.
 407       * @param string       $align Part of the class name for aligning the image.
 408       * @param string|int[] $size  Requested image size. Can be any registered image size name, or
 409       *                            an array of width and height values in pixels (in that order).
 410       */
 411      return apply_filters( 'get_image_tag', $html, $id, $alt, $title, $align, $size );
 412  }
 413  
 414  /**
 415   * Calculates the new dimensions for a down-sampled image.
 416   *
 417   * If either width or height are empty, no constraint is applied on
 418   * that dimension.
 419   *
 420   * @since 2.5.0
 421   *
 422   * @param int $current_width  Current width of the image.
 423   * @param int $current_height Current height of the image.
 424   * @param int $max_width      Optional. Max width in pixels to constrain to. Default 0.
 425   * @param int $max_height     Optional. Max height in pixels to constrain to. Default 0.
 426   * @return int[] {
 427   *     An array of width and height values.
 428   *
 429   *     @type int $0 The width in pixels.
 430   *     @type int $1 The height in pixels.
 431   * }
 432   */
 433  function wp_constrain_dimensions( $current_width, $current_height, $max_width = 0, $max_height = 0 ) {
 434      if ( ! $max_width && ! $max_height ) {
 435          return array( $current_width, $current_height );
 436      }
 437  
 438      $width_ratio  = 1.0;
 439      $height_ratio = 1.0;
 440      $did_width    = false;
 441      $did_height   = false;
 442  
 443      if ( $max_width > 0 && $current_width > 0 && $current_width > $max_width ) {
 444          $width_ratio = $max_width / $current_width;
 445          $did_width   = true;
 446      }
 447  
 448      if ( $max_height > 0 && $current_height > 0 && $current_height > $max_height ) {
 449          $height_ratio = $max_height / $current_height;
 450          $did_height   = true;
 451      }
 452  
 453      // Calculate the larger/smaller ratios.
 454      $smaller_ratio = min( $width_ratio, $height_ratio );
 455      $larger_ratio  = max( $width_ratio, $height_ratio );
 456  
 457      if ( (int) round( $current_width * $larger_ratio ) > $max_width || (int) round( $current_height * $larger_ratio ) > $max_height ) {
 458          // The larger ratio is too big. It would result in an overflow.
 459          $ratio = $smaller_ratio;
 460      } else {
 461          // The larger ratio fits, and is likely to be a more "snug" fit.
 462          $ratio = $larger_ratio;
 463      }
 464  
 465      // Very small dimensions may result in 0, 1 should be the minimum.
 466      $w = max( 1, (int) round( $current_width * $ratio ) );
 467      $h = max( 1, (int) round( $current_height * $ratio ) );
 468  
 469      /*
 470       * Sometimes, due to rounding, we'll end up with a result like this:
 471       * 465x700 in a 177x177 box is 117x176... a pixel short.
 472       * We also have issues with recursive calls resulting in an ever-changing result.
 473       * Constraining to the result of a constraint should yield the original result.
 474       * Thus we look for dimensions that are one pixel shy of the max value and bump them up.
 475       */
 476  
 477      // Note: $did_width means it is possible $smaller_ratio == $width_ratio.
 478      if ( $did_width && $w === $max_width - 1 ) {
 479          $w = $max_width; // Round it up.
 480      }
 481  
 482      // Note: $did_height means it is possible $smaller_ratio == $height_ratio.
 483      if ( $did_height && $h === $max_height - 1 ) {
 484          $h = $max_height; // Round it up.
 485      }
 486  
 487      /**
 488       * Filters dimensions to constrain down-sampled images to.
 489       *
 490       * @since 4.1.0
 491       *
 492       * @param int[] $dimensions     {
 493       *     An array of width and height values.
 494       *
 495       *     @type int $0 The width in pixels.
 496       *     @type int $1 The height in pixels.
 497       * }
 498       * @param int   $current_width  The current width of the image.
 499       * @param int   $current_height The current height of the image.
 500       * @param int   $max_width      The maximum width permitted.
 501       * @param int   $max_height     The maximum height permitted.
 502       */
 503      return apply_filters( 'wp_constrain_dimensions', array( $w, $h ), $current_width, $current_height, $max_width, $max_height );
 504  }
 505  
 506  /**
 507   * Retrieves calculated resize dimensions for use in WP_Image_Editor.
 508   *
 509   * Calculates dimensions and coordinates for a resized image that fits
 510   * within a specified width and height.
 511   *
 512   * Cropping behavior is dependent on the value of $crop:
 513   * 1. If false (default), images will not be cropped.
 514   * 2. If an array in the form of array( x_crop_position, y_crop_position ):
 515   *    - x_crop_position accepts 'left' 'center', or 'right'.
 516   *    - y_crop_position accepts 'top', 'center', or 'bottom'.
 517   *    Images will be cropped to the specified dimensions within the defined crop area.
 518   * 3. If true, images will be cropped to the specified dimensions using center positions.
 519   *
 520   * @since 2.5.0
 521   *
 522   * @param int        $orig_w Original width in pixels.
 523   * @param int        $orig_h Original height in pixels.
 524   * @param int        $dest_w New width in pixels.
 525   * @param int        $dest_h New height in pixels.
 526   * @param bool|array $crop   Optional. Whether to crop image to specified width and height or resize.
 527   *                           An array can specify positioning of the crop area. Default false.
 528   * @return array|false Returned array matches parameters for `imagecopyresampled()`. False on failure.
 529   */
 530  function image_resize_dimensions( $orig_w, $orig_h, $dest_w, $dest_h, $crop = false ) {
 531  
 532      if ( $orig_w <= 0 || $orig_h <= 0 ) {
 533          return false;
 534      }
 535      // At least one of $dest_w or $dest_h must be specific.
 536      if ( $dest_w <= 0 && $dest_h <= 0 ) {
 537          return false;
 538      }
 539  
 540      /**
 541       * Filters whether to preempt calculating the image resize dimensions.
 542       *
 543       * Returning a non-null value from the filter will effectively short-circuit
 544       * image_resize_dimensions(), returning that value instead.
 545       *
 546       * @since 3.4.0
 547       *
 548       * @param null|mixed $null   Whether to preempt output of the resize dimensions.
 549       * @param int        $orig_w Original width in pixels.
 550       * @param int        $orig_h Original height in pixels.
 551       * @param int        $dest_w New width in pixels.
 552       * @param int        $dest_h New height in pixels.
 553       * @param bool|array $crop   Whether to crop image to specified width and height or resize.
 554       *                           An array can specify positioning of the crop area. Default false.
 555       */
 556      $output = apply_filters( 'image_resize_dimensions', null, $orig_w, $orig_h, $dest_w, $dest_h, $crop );
 557  
 558      if ( null !== $output ) {
 559          return $output;
 560      }
 561  
 562      // Stop if the destination size is larger than the original image dimensions.
 563      if ( empty( $dest_h ) ) {
 564          if ( $orig_w < $dest_w ) {
 565              return false;
 566          }
 567      } elseif ( empty( $dest_w ) ) {
 568          if ( $orig_h < $dest_h ) {
 569              return false;
 570          }
 571      } else {
 572          if ( $orig_w < $dest_w && $orig_h < $dest_h ) {
 573              return false;
 574          }
 575      }
 576  
 577      if ( $crop ) {
 578          /*
 579           * Crop the largest possible portion of the original image that we can size to $dest_w x $dest_h.
 580           * Note that the requested crop dimensions are used as a maximum bounding box for the original image.
 581           * If the original image's width or height is less than the requested width or height
 582           * only the greater one will be cropped.
 583           * For example when the original image is 600x300, and the requested crop dimensions are 400x400,
 584           * the resulting image will be 400x300.
 585           */
 586          $aspect_ratio = $orig_w / $orig_h;
 587          $new_w        = min( $dest_w, $orig_w );
 588          $new_h        = min( $dest_h, $orig_h );
 589  
 590          if ( ! $new_w ) {
 591              $new_w = (int) round( $new_h * $aspect_ratio );
 592          }
 593  
 594          if ( ! $new_h ) {
 595              $new_h = (int) round( $new_w / $aspect_ratio );
 596          }
 597  
 598          $size_ratio = max( $new_w / $orig_w, $new_h / $orig_h );
 599  
 600          $crop_w = round( $new_w / $size_ratio );
 601          $crop_h = round( $new_h / $size_ratio );
 602  
 603          if ( ! is_array( $crop ) || count( $crop ) !== 2 ) {
 604              $crop = array( 'center', 'center' );
 605          }
 606  
 607          list( $x, $y ) = $crop;
 608  
 609          if ( 'left' === $x ) {
 610              $s_x = 0;
 611          } elseif ( 'right' === $x ) {
 612              $s_x = $orig_w - $crop_w;
 613          } else {
 614              $s_x = floor( ( $orig_w - $crop_w ) / 2 );
 615          }
 616  
 617          if ( 'top' === $y ) {
 618              $s_y = 0;
 619          } elseif ( 'bottom' === $y ) {
 620              $s_y = $orig_h - $crop_h;
 621          } else {
 622              $s_y = floor( ( $orig_h - $crop_h ) / 2 );
 623          }
 624      } else {
 625          // Resize using $dest_w x $dest_h as a maximum bounding box.
 626          $crop_w = $orig_w;
 627          $crop_h = $orig_h;
 628  
 629          $s_x = 0;
 630          $s_y = 0;
 631  
 632          list( $new_w, $new_h ) = wp_constrain_dimensions( $orig_w, $orig_h, $dest_w, $dest_h );
 633      }
 634  
 635      if ( wp_fuzzy_number_match( $new_w, $orig_w ) && wp_fuzzy_number_match( $new_h, $orig_h ) ) {
 636          // The new size has virtually the same dimensions as the original image.
 637  
 638          /**
 639           * Filters whether to proceed with making an image sub-size with identical dimensions
 640           * with the original/source image. Differences of 1px may be due to rounding and are ignored.
 641           *
 642           * @since 5.3.0
 643           *
 644           * @param bool $proceed The filtered value.
 645           * @param int  $orig_w  Original image width.
 646           * @param int  $orig_h  Original image height.
 647           */
 648          $proceed = (bool) apply_filters( 'wp_image_resize_identical_dimensions', false, $orig_w, $orig_h );
 649  
 650          if ( ! $proceed ) {
 651              return false;
 652          }
 653      }
 654  
 655      // The return array matches the parameters to imagecopyresampled().
 656      // int dst_x, int dst_y, int src_x, int src_y, int dst_w, int dst_h, int src_w, int src_h
 657      return array( 0, 0, (int) $s_x, (int) $s_y, (int) $new_w, (int) $new_h, (int) $crop_w, (int) $crop_h );
 658  }
 659  
 660  /**
 661   * Resizes an image to make a thumbnail or intermediate size.
 662   *
 663   * The returned array has the file size, the image width, and image height. The
 664   * {@see 'image_make_intermediate_size'} filter can be used to hook in and change the
 665   * values of the returned array. The only parameter is the resized file path.
 666   *
 667   * @since 2.5.0
 668   *
 669   * @param string $file   File path.
 670   * @param int    $width  Image width.
 671   * @param int    $height Image height.
 672   * @param bool   $crop   Optional. Whether to crop image to specified width and height or resize.
 673   *                       Default false.
 674   * @return array|false Metadata array on success. False if no image was created.
 675   */
 676  function image_make_intermediate_size( $file, $width, $height, $crop = false ) {
 677      if ( $width || $height ) {
 678          $editor = wp_get_image_editor( $file );
 679  
 680          if ( is_wp_error( $editor ) || is_wp_error( $editor->resize( $width, $height, $crop ) ) ) {
 681              return false;
 682          }
 683  
 684          $resized_file = $editor->save();
 685  
 686          if ( ! is_wp_error( $resized_file ) && $resized_file ) {
 687              unset( $resized_file['path'] );
 688              return $resized_file;
 689          }
 690      }
 691      return false;
 692  }
 693  
 694  /**
 695   * Helper function to test if aspect ratios for two images match.
 696   *
 697   * @since 4.6.0
 698   *
 699   * @param int $source_width  Width of the first image in pixels.
 700   * @param int $source_height Height of the first image in pixels.
 701   * @param int $target_width  Width of the second image in pixels.
 702   * @param int $target_height Height of the second image in pixels.
 703   * @return bool True if aspect ratios match within 1px. False if not.
 704   */
 705  function wp_image_matches_ratio( $source_width, $source_height, $target_width, $target_height ) {
 706      /*
 707       * To test for varying crops, we constrain the dimensions of the larger image
 708       * to the dimensions of the smaller image and see if they match.
 709       */
 710      if ( $source_width > $target_width ) {
 711          $constrained_size = wp_constrain_dimensions( $source_width, $source_height, $target_width );
 712          $expected_size    = array( $target_width, $target_height );
 713      } else {
 714          $constrained_size = wp_constrain_dimensions( $target_width, $target_height, $source_width );
 715          $expected_size    = array( $source_width, $source_height );
 716      }
 717  
 718      // If the image dimensions are within 1px of the expected size, we consider it a match.
 719      $matched = ( wp_fuzzy_number_match( $constrained_size[0], $expected_size[0] ) && wp_fuzzy_number_match( $constrained_size[1], $expected_size[1] ) );
 720  
 721      return $matched;
 722  }
 723  
 724  /**
 725   * Retrieves the image's intermediate size (resized) path, width, and height.
 726   *
 727   * The $size parameter can be an array with the width and height respectively.
 728   * If the size matches the 'sizes' metadata array for width and height, then it
 729   * will be used. If there is no direct match, then the nearest image size larger
 730   * than the specified size will be used. If nothing is found, then the function
 731   * will break out and return false.
 732   *
 733   * The metadata 'sizes' is used for compatible sizes that can be used for the
 734   * parameter $size value.
 735   *
 736   * The url path will be given, when the $size parameter is a string.
 737   *
 738   * If you are passing an array for the $size, you should consider using
 739   * add_image_size() so that a cropped version is generated. It's much more
 740   * efficient than having to find the closest-sized image and then having the
 741   * browser scale down the image.
 742   *
 743   * @since 2.5.0
 744   *
 745   * @param int          $post_id Attachment ID.
 746   * @param string|int[] $size    Optional. Image size. Accepts any registered image size name, or an array
 747   *                              of width and height values in pixels (in that order). Default 'thumbnail'.
 748   * @return array|false {
 749   *     Array of file relative path, width, and height on success. Additionally includes absolute
 750   *     path and URL if registered size is passed to `$size` parameter. False on failure.
 751   *
 752   *     @type string $file   Path of image relative to uploads directory.
 753   *     @type int    $width  Width of image in pixels.
 754   *     @type int    $height Height of image in pixels.
 755   *     @type string $path   Absolute filesystem path of image.
 756   *     @type string $url    URL of image.
 757   * }
 758   */
 759  function image_get_intermediate_size( $post_id, $size = 'thumbnail' ) {
 760      $imagedata = wp_get_attachment_metadata( $post_id );
 761  
 762      if ( ! $size || ! is_array( $imagedata ) || empty( $imagedata['sizes'] ) ) {
 763          return false;
 764      }
 765  
 766      $data = array();
 767  
 768      // Find the best match when '$size' is an array.
 769      if ( is_array( $size ) ) {
 770          $candidates = array();
 771  
 772          if ( ! isset( $imagedata['file'] ) && isset( $imagedata['sizes']['full'] ) ) {
 773              $imagedata['height'] = $imagedata['sizes']['full']['height'];
 774              $imagedata['width']  = $imagedata['sizes']['full']['width'];
 775          }
 776  
 777          foreach ( $imagedata['sizes'] as $_size => $data ) {
 778              // If there's an exact match to an existing image size, short circuit.
 779              if ( (int) $data['width'] === (int) $size[0] && (int) $data['height'] === (int) $size[1] ) {
 780                  $candidates[ $data['width'] * $data['height'] ] = $data;
 781                  break;
 782              }
 783  
 784              // If it's not an exact match, consider larger sizes with the same aspect ratio.
 785              if ( $data['width'] >= $size[0] && $data['height'] >= $size[1] ) {
 786                  // If '0' is passed to either size, we test ratios against the original file.
 787                  if ( 0 === $size[0] || 0 === $size[1] ) {
 788                      $same_ratio = wp_image_matches_ratio( $data['width'], $data['height'], $imagedata['width'], $imagedata['height'] );
 789                  } else {
 790                      $same_ratio = wp_image_matches_ratio( $data['width'], $data['height'], $size[0], $size[1] );
 791                  }
 792  
 793                  if ( $same_ratio ) {
 794                      $candidates[ $data['width'] * $data['height'] ] = $data;
 795                  }
 796              }
 797          }
 798  
 799          if ( ! empty( $candidates ) ) {
 800              // Sort the array by size if we have more than one candidate.
 801              if ( 1 < count( $candidates ) ) {
 802                  ksort( $candidates );
 803              }
 804  
 805              $data = array_shift( $candidates );
 806              /*
 807              * When the size requested is smaller than the thumbnail dimensions, we
 808              * fall back to the thumbnail size to maintain backward compatibility with
 809              * pre 4.6 versions of WordPress.
 810              */
 811          } elseif ( ! empty( $imagedata['sizes']['thumbnail'] ) && $imagedata['sizes']['thumbnail']['width'] >= $size[0] && $imagedata['sizes']['thumbnail']['width'] >= $size[1] ) {
 812              $data = $imagedata['sizes']['thumbnail'];
 813          } else {
 814              return false;
 815          }
 816  
 817          // Constrain the width and height attributes to the requested values.
 818          list( $data['width'], $data['height'] ) = image_constrain_size_for_editor( $data['width'], $data['height'], $size );
 819  
 820      } elseif ( ! empty( $imagedata['sizes'][ $size ] ) ) {
 821          $data = $imagedata['sizes'][ $size ];
 822      }
 823  
 824      // If we still don't have a match at this point, return false.
 825      if ( empty( $data ) ) {
 826          return false;
 827      }
 828  
 829      // Include the full filesystem path of the intermediate file.
 830      if ( empty( $data['path'] ) && ! empty( $data['file'] ) && ! empty( $imagedata['file'] ) ) {
 831          $file_url     = wp_get_attachment_url( $post_id );
 832          $data['path'] = path_join( dirname( $imagedata['file'] ), $data['file'] );
 833          $data['url']  = path_join( dirname( $file_url ), $data['file'] );
 834      }
 835  
 836      /**
 837       * Filters the output of image_get_intermediate_size()
 838       *
 839       * @since 4.4.0
 840       *
 841       * @see image_get_intermediate_size()
 842       *
 843       * @param array        $data    Array of file relative path, width, and height on success. May also include
 844       *                              file absolute path and URL.
 845       * @param int          $post_id The ID of the image attachment.
 846       * @param string|int[] $size    Requested image size. Can be any registered image size name, or
 847       *                              an array of width and height values in pixels (in that order).
 848       */
 849      return apply_filters( 'image_get_intermediate_size', $data, $post_id, $size );
 850  }
 851  
 852  /**
 853   * Gets the available intermediate image size names.
 854   *
 855   * @since 3.0.0
 856   *
 857   * @return string[] An array of image size names.
 858   */
 859  function get_intermediate_image_sizes() {
 860      $default_sizes    = array( 'thumbnail', 'medium', 'medium_large', 'large' );
 861      $additional_sizes = wp_get_additional_image_sizes();
 862  
 863      if ( ! empty( $additional_sizes ) ) {
 864          $default_sizes = array_merge( $default_sizes, array_keys( $additional_sizes ) );
 865      }
 866  
 867      /**
 868       * Filters the list of intermediate image sizes.
 869       *
 870       * @since 2.5.0
 871       *
 872       * @param string[] $default_sizes An array of intermediate image size names. Defaults
 873       *                                are 'thumbnail', 'medium', 'medium_large', 'large'.
 874       */
 875      return apply_filters( 'intermediate_image_sizes', $default_sizes );
 876  }
 877  
 878  /**
 879   * Returns a normalized list of all currently registered image sub-sizes.
 880   *
 881   * @since 5.3.0
 882   * @uses wp_get_additional_image_sizes()
 883   * @uses get_intermediate_image_sizes()
 884   *
 885   * @return array[] Associative array of arrays of image sub-size information,
 886   *                 keyed by image size name.
 887   */
 888  function wp_get_registered_image_subsizes() {
 889      $additional_sizes = wp_get_additional_image_sizes();
 890      $all_sizes        = array();
 891  
 892      foreach ( get_intermediate_image_sizes() as $size_name ) {
 893          $size_data = array(
 894              'width'  => 0,
 895              'height' => 0,
 896              'crop'   => false,
 897          );
 898  
 899          if ( isset( $additional_sizes[ $size_name ]['width'] ) ) {
 900              // For sizes added by plugins and themes.
 901              $size_data['width'] = (int) $additional_sizes[ $size_name ]['width'];
 902          } else {
 903              // For default sizes set in options.
 904              $size_data['width'] = (int) get_option( "{$size_name}_size_w" );
 905          }
 906  
 907          if ( isset( $additional_sizes[ $size_name ]['height'] ) ) {
 908              $size_data['height'] = (int) $additional_sizes[ $size_name ]['height'];
 909          } else {
 910              $size_data['height'] = (int) get_option( "{$size_name}_size_h" );
 911          }
 912  
 913          if ( empty( $size_data['width'] ) && empty( $size_data['height'] ) ) {
 914              // This size isn't set.
 915              continue;
 916          }
 917  
 918          if ( isset( $additional_sizes[ $size_name ]['crop'] ) ) {
 919              $size_data['crop'] = $additional_sizes[ $size_name ]['crop'];
 920          } else {
 921              $size_data['crop'] = get_option( "{$size_name}_crop" );
 922          }
 923  
 924          if ( ! is_array( $size_data['crop'] ) || empty( $size_data['crop'] ) ) {
 925              $size_data['crop'] = (bool) $size_data['crop'];
 926          }
 927  
 928          $all_sizes[ $size_name ] = $size_data;
 929      }
 930  
 931      return $all_sizes;
 932  }
 933  
 934  /**
 935   * Retrieves an image to represent an attachment.
 936   *
 937   * @since 2.5.0
 938   *
 939   * @param int          $attachment_id Image attachment ID.
 940   * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array of
 941   *                                    width and height values in pixels (in that order). Default 'thumbnail'.
 942   * @param bool         $icon          Optional. Whether the image should fall back to a mime type icon. Default false.
 943   * @return array|false {
 944   *     Array of image data, or boolean false if no image is available.
 945   *
 946   *     @type string $0 Image source URL.
 947   *     @type int    $1 Image width in pixels.
 948   *     @type int    $2 Image height in pixels.
 949   *     @type bool   $3 Whether the image is a resized image.
 950   * }
 951   */
 952  function wp_get_attachment_image_src( $attachment_id, $size = 'thumbnail', $icon = false ) {
 953      // Get a thumbnail or intermediate image if there is one.
 954      $image = image_downsize( $attachment_id, $size );
 955      if ( ! $image ) {
 956          $src = false;
 957  
 958          if ( $icon ) {
 959              $src = wp_mime_type_icon( $attachment_id );
 960  
 961              if ( $src ) {
 962                  /** This filter is documented in wp-includes/post.php */
 963                  $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );
 964  
 965                  $src_file               = $icon_dir . '/' . wp_basename( $src );
 966                  list( $width, $height ) = wp_getimagesize( $src_file );
 967              }
 968          }
 969  
 970          if ( $src && $width && $height ) {
 971              $image = array( $src, $width, $height, false );
 972          }
 973      }
 974      /**
 975       * Filters the attachment image source result.
 976       *
 977       * @since 4.3.0
 978       *
 979       * @param array|false  $image         {
 980       *     Array of image data, or boolean false if no image is available.
 981       *
 982       *     @type string $0 Image source URL.
 983       *     @type int    $1 Image width in pixels.
 984       *     @type int    $2 Image height in pixels.
 985       *     @type bool   $3 Whether the image is a resized image.
 986       * }
 987       * @param int          $attachment_id Image attachment ID.
 988       * @param string|int[] $size          Requested image size. Can be any registered image size name, or
 989       *                                    an array of width and height values in pixels (in that order).
 990       * @param bool         $icon          Whether the image should be treated as an icon.
 991       */
 992      return apply_filters( 'wp_get_attachment_image_src', $image, $attachment_id, $size, $icon );
 993  }
 994  
 995  /**
 996   * Get an HTML img element representing an image attachment.
 997   *
 998   * While `$size` will accept an array, it is better to register a size with
 999   * add_image_size() so that a cropped version is generated. It's much more
1000   * efficient than having to find the closest-sized image and then having the
1001   * browser scale down the image.
1002   *
1003   * @since 2.5.0
1004   * @since 4.4.0 The `$srcset` and `$sizes` attributes were added.
1005   * @since 5.5.0 The `$loading` attribute was added.
1006   *
1007   * @param int          $attachment_id Image attachment ID.
1008   * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array
1009   *                                    of width and height values in pixels (in that order). Default 'thumbnail'.
1010   * @param bool         $icon          Optional. Whether the image should be treated as an icon. Default false.
1011   * @param string|array $attr {
1012   *     Optional. Attributes for the image markup.
1013   *
1014   *     @type string       $src     Image attachment URL.
1015   *     @type string       $class   CSS class name or space-separated list of classes.
1016   *                                 Default `attachment-$size_class size-$size_class`,
1017   *                                 where `$size_class` is the image size being requested.
1018   *     @type string       $alt     Image description for the alt attribute.
1019   *     @type string       $srcset  The 'srcset' attribute value.
1020   *     @type string       $sizes   The 'sizes' attribute value.
1021   *     @type string|false $loading The 'loading' attribute value. Passing a value of false
1022   *                                 will result in the attribute being omitted for the image.
1023   *                                 Defaults to 'lazy', depending on wp_lazy_loading_enabled().
1024   * }
1025   * @return string HTML img element or empty string on failure.
1026   */
1027  function wp_get_attachment_image( $attachment_id, $size = 'thumbnail', $icon = false, $attr = '' ) {
1028      $html  = '';
1029      $image = wp_get_attachment_image_src( $attachment_id, $size, $icon );
1030  
1031      if ( $image ) {
1032          list( $src, $width, $height ) = $image;
1033  
1034          $attachment = get_post( $attachment_id );
1035          $hwstring   = image_hwstring( $width, $height );
1036          $size_class = $size;
1037  
1038          if ( is_array( $size_class ) ) {
1039              $size_class = implode( 'x', $size_class );
1040          }
1041  
1042          $default_attr = array(
1043              'src'   => $src,
1044              'class' => "attachment-$size_class size-$size_class",
1045              'alt'   => trim( strip_tags( get_post_meta( $attachment_id, '_wp_attachment_image_alt', true ) ) ),
1046          );
1047  
1048          // Add `loading` attribute.
1049          if ( wp_lazy_loading_enabled( 'img', 'wp_get_attachment_image' ) ) {
1050              $default_attr['loading'] = wp_get_loading_attr_default( 'wp_get_attachment_image' );
1051          }
1052  
1053          $attr = wp_parse_args( $attr, $default_attr );
1054  
1055          // If the default value of `lazy` for the `loading` attribute is overridden
1056          // to omit the attribute for this image, ensure it is not included.
1057          if ( array_key_exists( 'loading', $attr ) && ! $attr['loading'] ) {
1058              unset( $attr['loading'] );
1059          }
1060  
1061          // Generate 'srcset' and 'sizes' if not already present.
1062          if ( empty( $attr['srcset'] ) ) {
1063              $image_meta = wp_get_attachment_metadata( $attachment_id );
1064  
1065              if ( is_array( $image_meta ) ) {
1066                  $size_array = array( absint( $width ), absint( $height ) );
1067                  $srcset     = wp_calculate_image_srcset( $size_array, $src, $image_meta, $attachment_id );
1068                  $sizes      = wp_calculate_image_sizes( $size_array, $src, $image_meta, $attachment_id );
1069  
1070                  if ( $srcset && ( $sizes || ! empty( $attr['sizes'] ) ) ) {
1071                      $attr['srcset'] = $srcset;
1072  
1073                      if ( empty( $attr['sizes'] ) ) {
1074                          $attr['sizes'] = $sizes;
1075                      }
1076                  }
1077              }
1078          }
1079  
1080          /**
1081           * Filters the list of attachment image attributes.
1082           *
1083           * @since 2.8.0
1084           *
1085           * @param string[]     $attr       Array of attribute values for the image markup, keyed by attribute name.
1086           *                                 See wp_get_attachment_image().
1087           * @param WP_Post      $attachment Image attachment post.
1088           * @param string|int[] $size       Requested image size. Can be any registered image size name, or
1089           *                                 an array of width and height values in pixels (in that order).
1090           */
1091          $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment, $size );
1092  
1093          $attr = array_map( 'esc_attr', $attr );
1094          $html = rtrim( "<img $hwstring" );
1095  
1096          foreach ( $attr as $name => $value ) {
1097              $html .= " $name=" . '"' . $value . '"';
1098          }
1099  
1100          $html .= ' />';
1101      }
1102  
1103      /**
1104       * HTML img element representing an image attachment.
1105       *
1106       * @since 5.6.0
1107       *
1108       * @param string       $html          HTML img element or empty string on failure.
1109       * @param int          $attachment_id Image attachment ID.
1110       * @param string|int[] $size          Requested image size. Can be any registered image size name, or
1111       *                                    an array of width and height values in pixels (in that order).
1112       * @param bool         $icon          Whether the image should be treated as an icon.
1113       * @param string[]     $attr          Array of attribute values for the image markup, keyed by attribute name.
1114       *                                    See wp_get_attachment_image().
1115       */
1116      return apply_filters( 'wp_get_attachment_image', $html, $attachment_id, $size, $icon, $attr );
1117  }
1118  
1119  /**
1120   * Get the URL of an image attachment.
1121   *
1122   * @since 4.4.0
1123   *
1124   * @param int          $attachment_id Image attachment ID.
1125   * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array of
1126   *                                    width and height values in pixels (in that order). Default 'thumbnail'.
1127   * @param bool         $icon          Optional. Whether the image should be treated as an icon. Default false.
1128   * @return string|false Attachment URL or false if no image is available. If `$size` does not match
1129   *                      any registered image size, the original image URL will be returned.
1130   */
1131  function wp_get_attachment_image_url( $attachment_id, $size = 'thumbnail', $icon = false ) {
1132      $image = wp_get_attachment_image_src( $attachment_id, $size, $icon );
1133      return isset( $image[0] ) ? $image[0] : false;
1134  }
1135  
1136  /**
1137   * Get the attachment path relative to the upload directory.
1138   *
1139   * @since 4.4.1
1140   * @access private
1141   *
1142   * @param string $file Attachment file name.
1143   * @return string Attachment path relative to the upload directory.
1144   */
1145  function _wp_get_attachment_relative_path( $file ) {
1146      $dirname = dirname( $file );
1147  
1148      if ( '.' === $dirname ) {
1149          return '';
1150      }
1151  
1152      if ( false !== strpos( $dirname, 'wp-content/uploads' ) ) {
1153          // Get the directory name relative to the upload directory (back compat for pre-2.7 uploads).
1154          $dirname = substr( $dirname, strpos( $dirname, 'wp-content/uploads' ) + 18 );
1155          $dirname = ltrim( $dirname, '/' );
1156      }
1157  
1158      return $dirname;
1159  }
1160  
1161  /**
1162   * Get the image size as array from its meta data.
1163   *
1164   * Used for responsive images.
1165   *
1166   * @since 4.4.0
1167   * @access private
1168   *
1169   * @param string $size_name  Image size. Accepts any registered image size name.
1170   * @param array  $image_meta The image meta data.
1171   * @return array|false {
1172   *     Array of width and height or false if the size isn't present in the meta data.
1173   *
1174   *     @type int $0 Image width.
1175   *     @type int $1 Image height.
1176   * }
1177   */
1178  function _wp_get_image_size_from_meta( $size_name, $image_meta ) {
1179      if ( 'full' === $size_name ) {
1180          return array(
1181              absint( $image_meta['width'] ),
1182              absint( $image_meta['height'] ),
1183          );
1184      } elseif ( ! empty( $image_meta['sizes'][ $size_name ] ) ) {
1185          return array(
1186              absint( $image_meta['sizes'][ $size_name ]['width'] ),
1187              absint( $image_meta['sizes'][ $size_name ]['height'] ),
1188          );
1189      }
1190  
1191      return false;
1192  }
1193  
1194  /**
1195   * Retrieves the value for an image attachment's 'srcset' attribute.
1196   *
1197   * @since 4.4.0
1198   *
1199   * @see wp_calculate_image_srcset()
1200   *
1201   * @param int          $attachment_id Image attachment ID.
1202   * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array of
1203   *                                    width and height values in pixels (in that order). Default 'medium'.
1204   * @param array        $image_meta    Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
1205   *                                    Default null.
1206   * @return string|false A 'srcset' value string or false.
1207   */
1208  function wp_get_attachment_image_srcset( $attachment_id, $size = 'medium', $image_meta = null ) {
1209      $image = wp_get_attachment_image_src( $attachment_id, $size );
1210  
1211      if ( ! $image ) {
1212          return false;
1213      }
1214  
1215      if ( ! is_array( $image_meta ) ) {
1216          $image_meta = wp_get_attachment_metadata( $attachment_id );
1217      }
1218  
1219      $image_src  = $image[0];
1220      $size_array = array(
1221          absint( $image[1] ),
1222          absint( $image[2] ),
1223      );
1224  
1225      return wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );
1226  }
1227  
1228  /**
1229   * A helper function to calculate the image sources to include in a 'srcset' attribute.
1230   *
1231   * @since 4.4.0
1232   *
1233   * @param int[]  $size_array    {
1234   *     An array of width and height values.
1235   *
1236   *     @type int $0 The width in pixels.
1237   *     @type int $1 The height in pixels.
1238   * }
1239   * @param string $image_src     The 'src' of the image.
1240   * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
1241   * @param int    $attachment_id Optional. The image attachment ID. Default 0.
1242   * @return string|false The 'srcset' attribute value. False on error or when only one source exists.
1243   */
1244  function wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id = 0 ) {
1245      /**
1246       * Let plugins pre-filter the image meta to be able to fix inconsistencies in the stored data.
1247       *
1248       * @since 4.5.0
1249       *
1250       * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
1251       * @param int[]  $size_array    {
1252       *     An array of requested width and height values.
1253       *
1254       *     @type int $0 The width in pixels.
1255       *     @type int $1 The height in pixels.
1256       * }
1257       * @param string $image_src     The 'src' of the image.
1258       * @param int    $attachment_id The image attachment ID or 0 if not supplied.
1259       */
1260      $image_meta = apply_filters( 'wp_calculate_image_srcset_meta', $image_meta, $size_array, $image_src, $attachment_id );
1261  
1262      if ( empty( $image_meta['sizes'] ) || ! isset( $image_meta['file'] ) || strlen( $image_meta['file'] ) < 4 ) {
1263          return false;
1264      }
1265  
1266      $image_sizes = $image_meta['sizes'];
1267  
1268      // Get the width and height of the image.
1269      $image_width  = (int) $size_array[0];
1270      $image_height = (int) $size_array[1];
1271  
1272      // Bail early if error/no width.
1273      if ( $image_width < 1 ) {
1274          return false;
1275      }
1276  
1277      $image_basename = wp_basename( $image_meta['file'] );
1278  
1279      /*
1280       * WordPress flattens animated GIFs into one frame when generating intermediate sizes.
1281       * To avoid hiding animation in user content, if src is a full size GIF, a srcset attribute is not generated.
1282       * If src is an intermediate size GIF, the full size is excluded from srcset to keep a flattened GIF from becoming animated.
1283       */
1284      if ( ! isset( $image_sizes['thumbnail']['mime-type'] ) || 'image/gif' !== $image_sizes['thumbnail']['mime-type'] ) {
1285          $image_sizes[] = array(
1286              'width'  => $image_meta['width'],
1287              'height' => $image_meta['height'],
1288              'file'   => $image_basename,
1289          );
1290      } elseif ( strpos( $image_src, $image_meta['file'] ) ) {
1291          return false;
1292      }
1293  
1294      // Retrieve the uploads sub-directory from the full size image.
1295      $dirname = _wp_get_attachment_relative_path( $image_meta['file'] );
1296  
1297      if ( $dirname ) {
1298          $dirname = trailingslashit( $dirname );
1299      }
1300  
1301      $upload_dir    = wp_get_upload_dir();
1302      $image_baseurl = trailingslashit( $upload_dir['baseurl'] ) . $dirname;
1303  
1304      /*
1305       * If currently on HTTPS, prefer HTTPS URLs when we know they're supported by the domain
1306       * (which is to say, when they share the domain name of the current request).
1307       */
1308      if ( is_ssl() && 'https' !== substr( $image_baseurl, 0, 5 ) && parse_url( $image_baseurl, PHP_URL_HOST ) === $_SERVER['HTTP_HOST'] ) {
1309          $image_baseurl = set_url_scheme( $image_baseurl, 'https' );
1310      }
1311  
1312      /*
1313       * Images that have been edited in WordPress after being uploaded will
1314       * contain a unique hash. Look for that hash and use it later to filter
1315       * out images that are leftovers from previous versions.
1316       */
1317      $image_edited = preg_match( '/-e[0-9]{13}/', wp_basename( $image_src ), $image_edit_hash );
1318  
1319      /**
1320       * Filters the maximum image width to be included in a 'srcset' attribute.
1321       *
1322       * @since 4.4.0
1323       *
1324       * @param int   $max_width  The maximum image width to be included in the 'srcset'. Default '2048'.
1325       * @param int[] $size_array {
1326       *     An array of requested width and height values.
1327       *
1328       *     @type int $0 The width in pixels.
1329       *     @type int $1 The height in pixels.
1330       * }
1331       */
1332      $max_srcset_image_width = apply_filters( 'max_srcset_image_width', 2048, $size_array );
1333  
1334      // Array to hold URL candidates.
1335      $sources = array();
1336  
1337      /**
1338       * To make sure the ID matches our image src, we will check to see if any sizes in our attachment
1339       * meta match our $image_src. If no matches are found we don't return a srcset to avoid serving
1340       * an incorrect image. See #35045.
1341       */
1342      $src_matched = false;
1343  
1344      /*
1345       * Loop through available images. Only use images that are resized
1346       * versions of the same edit.
1347       */
1348      foreach ( $image_sizes as $image ) {
1349          $is_src = false;
1350  
1351          // Check if image meta isn't corrupted.
1352          if ( ! is_array( $image ) ) {
1353              continue;
1354          }
1355  
1356          // If the file name is part of the `src`, we've confirmed a match.
1357          if ( ! $src_matched && false !== strpos( $image_src, $dirname . $image['file'] ) ) {
1358              $src_matched = true;
1359              $is_src      = true;
1360          }
1361  
1362          // Filter out images that are from previous edits.
1363          if ( $image_edited && ! strpos( $image['file'], $image_edit_hash[0] ) ) {
1364              continue;
1365          }
1366  
1367          /*
1368           * Filters out images that are wider than '$max_srcset_image_width' unless
1369           * that file is in the 'src' attribute.
1370           */
1371          if ( $max_srcset_image_width && $image['width'] > $max_srcset_image_width && ! $is_src ) {
1372              continue;
1373          }
1374  
1375          // If the image dimensions are within 1px of the expected size, use it.
1376          if ( wp_image_matches_ratio( $image_width, $image_height, $image['width'], $image['height'] ) ) {
1377              // Add the URL, descriptor, and value to the sources array to be returned.
1378              $source = array(
1379                  'url'        => $image_baseurl . $image['file'],
1380                  'descriptor' => 'w',
1381                  'value'      => $image['width'],
1382              );
1383  
1384              // The 'src' image has to be the first in the 'srcset', because of a bug in iOS8. See #35030.
1385              if ( $is_src ) {
1386                  $sources = array( $image['width'] => $source ) + $sources;
1387              } else {
1388                  $sources[ $image['width'] ] = $source;
1389              }
1390          }
1391      }
1392  
1393      /**
1394       * Filters an image's 'srcset' sources.
1395       *
1396       * @since 4.4.0
1397       *
1398       * @param array  $sources {
1399       *     One or more arrays of source data to include in the 'srcset'.
1400       *
1401       *     @type array $width {
1402       *         @type string $url        The URL of an image source.
1403       *         @type string $descriptor The descriptor type used in the image candidate string,
1404       *                                  either 'w' or 'x'.
1405       *         @type int    $value      The source width if paired with a 'w' descriptor, or a
1406       *                                  pixel density value if paired with an 'x' descriptor.
1407       *     }
1408       * }
1409       * @param array $size_array     {
1410       *     An array of requested width and height values.
1411       *
1412       *     @type int $0 The width in pixels.
1413       *     @type int $1 The height in pixels.
1414       * }
1415       * @param string $image_src     The 'src' of the image.
1416       * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
1417       * @param int    $attachment_id Image attachment ID or 0.
1418       */
1419      $sources = apply_filters( 'wp_calculate_image_srcset', $sources, $size_array, $image_src, $image_meta, $attachment_id );
1420  
1421      // Only return a 'srcset' value if there is more than one source.
1422      if ( ! $src_matched || ! is_array( $sources ) || count( $sources ) < 2 ) {
1423          return false;
1424      }
1425  
1426      $srcset = '';
1427  
1428      foreach ( $sources as $source ) {
1429          $srcset .= str_replace( ' ', '%20', $source['url'] ) . ' ' . $source['value'] . $source['descriptor'] . ', ';
1430      }
1431  
1432      return rtrim( $srcset, ', ' );
1433  }
1434  
1435  /**
1436   * Retrieves the value for an image attachment's 'sizes' attribute.
1437   *
1438   * @since 4.4.0
1439   *
1440   * @see wp_calculate_image_sizes()
1441   *
1442   * @param int          $attachment_id Image attachment ID.
1443   * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array of
1444   *                                    width and height values in pixels (in that order). Default 'medium'.
1445   * @param array        $image_meta    Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
1446   *                                    Default null.
1447   * @return string|false A valid source size value for use in a 'sizes' attribute or false.
1448   */
1449  function wp_get_attachment_image_sizes( $attachment_id, $size = 'medium', $image_meta = null ) {
1450      $image = wp_get_attachment_image_src( $attachment_id, $size );
1451  
1452      if ( ! $image ) {
1453          return false;
1454      }
1455  
1456      if ( ! is_array( $image_meta ) ) {
1457          $image_meta = wp_get_attachment_metadata( $attachment_id );
1458      }
1459  
1460      $image_src  = $image[0];
1461      $size_array = array(
1462          absint( $image[1] ),
1463          absint( $image[2] ),
1464      );
1465  
1466      return wp_calculate_image_sizes( $size_array, $image_src, $image_meta, $attachment_id );
1467  }
1468  
1469  /**
1470   * Creates a 'sizes' attribute value for an image.
1471   *
1472   * @since 4.4.0
1473   *
1474   * @param string|int[] $size          Image size. Accepts any registered image size name, or an array of
1475   *                                    width and height values in pixels (in that order).
1476   * @param string       $image_src     Optional. The URL to the image file. Default null.
1477   * @param array        $image_meta    Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
1478   *                                    Default null.
1479   * @param int          $attachment_id Optional. Image attachment ID. Either `$image_meta` or `$attachment_id`
1480   *                                    is needed when using the image size name as argument for `$size`. Default 0.
1481   * @return string|false A valid source size value for use in a 'sizes' attribute or false.
1482   */
1483  function wp_calculate_image_sizes( $size, $image_src = null, $image_meta = null, $attachment_id = 0 ) {
1484      $width = 0;
1485  
1486      if ( is_array( $size ) ) {
1487          $width = absint( $size[0] );
1488      } elseif ( is_string( $size ) ) {
1489          if ( ! $image_meta && $attachment_id ) {
1490              $image_meta = wp_get_attachment_metadata( $attachment_id );
1491          }
1492  
1493          if ( is_array( $image_meta ) ) {
1494              $size_array = _wp_get_image_size_from_meta( $size, $image_meta );
1495              if ( $size_array ) {
1496                  $width = absint( $size_array[0] );
1497              }
1498          }
1499      }
1500  
1501      if ( ! $width ) {
1502          return false;
1503      }
1504  
1505      // Setup the default 'sizes' attribute.
1506      $sizes = sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $width );
1507  
1508      /**
1509       * Filters the output of 'wp_calculate_image_sizes()'.
1510       *
1511       * @since 4.4.0
1512       *
1513       * @param string       $sizes         A source size value for use in a 'sizes' attribute.
1514       * @param string|int[] $size          Requested image size. Can be any registered image size name, or
1515       *                                    an array of width and height values in pixels (in that order).
1516       * @param string|null  $image_src     The URL to the image file or null.
1517       * @param array|null   $image_meta    The image meta data as returned by wp_get_attachment_metadata() or null.
1518       * @param int          $attachment_id Image attachment ID of the original image or 0.
1519       */
1520      return apply_filters( 'wp_calculate_image_sizes', $sizes, $size, $image_src, $image_meta, $attachment_id );
1521  }
1522  
1523  /**
1524   * Determines if the image meta data is for the image source file.
1525   *
1526   * The image meta data is retrieved by attachment post ID. In some cases the post IDs may change.
1527   * For example when the website is exported and imported at another website. Then the
1528   * attachment post IDs that are in post_content for the exported website may not match
1529   * the same attachments at the new website.
1530   *
1531   * @since 5.5.0
1532   *
1533   * @param string $image_location The full path or URI to the image file.
1534   * @param array  $image_meta     The attachment meta data as returned by 'wp_get_attachment_metadata()'.
1535   * @param int    $attachment_id  Optional. The image attachment ID. Default 0.
1536   * @return bool Whether the image meta is for this image file.
1537   */
1538  function wp_image_file_matches_image_meta( $image_location, $image_meta, $attachment_id = 0 ) {
1539      $match = false;
1540  
1541      // Ensure the $image_meta is valid.
1542      if ( isset( $image_meta['file'] ) && strlen( $image_meta['file'] ) > 4 ) {
1543          // Remove quiery args if image URI.
1544          list( $image_location ) = explode( '?', $image_location );
1545  
1546          // Check if the relative image path from the image meta is at the end of $image_location.
1547          if ( strrpos( $image_location, $image_meta['file'] ) === strlen( $image_location ) - strlen( $image_meta['file'] ) ) {
1548              $match = true;
1549          } else {
1550              // Retrieve the uploads sub-directory from the full size image.
1551              $dirname = _wp_get_attachment_relative_path( $image_meta['file'] );
1552  
1553              if ( $dirname ) {
1554                  $dirname = trailingslashit( $dirname );
1555              }
1556  
1557              if ( ! empty( $image_meta['original_image'] ) ) {
1558                  $relative_path = $dirname . $image_meta['original_image'];
1559  
1560                  if ( strrpos( $image_location, $relative_path ) === strlen( $image_location ) - strlen( $relative_path ) ) {
1561                      $match = true;
1562                  }
1563              }
1564  
1565              if ( ! $match && ! empty( $image_meta['sizes'] ) ) {
1566                  foreach ( $image_meta['sizes'] as $image_size_data ) {
1567                      $relative_path = $dirname . $image_size_data['file'];
1568  
1569                      if ( strrpos( $image_location, $relative_path ) === strlen( $image_location ) - strlen( $relative_path ) ) {
1570                          $match = true;
1571                          break;
1572                      }
1573                  }
1574              }
1575          }
1576      }
1577  
1578      /**
1579       * Filters whether an image path or URI matches image meta.
1580       *
1581       * @since 5.5.0
1582       *
1583       * @param bool   $match          Whether the image relative path from the image meta
1584       *                               matches the end of the URI or path to the image file.
1585       * @param string $image_location Full path or URI to the tested image file.
1586       * @param array  $image_meta     The image meta data as returned by 'wp_get_attachment_metadata()'.
1587       * @param int    $attachment_id  The image attachment ID or 0 if not supplied.
1588       */
1589      return apply_filters( 'wp_image_file_matches_image_meta', $match, $image_location, $image_meta, $attachment_id );
1590  }
1591  
1592  /**
1593   * Determines an image's width and height dimensions based on the source file.
1594   *
1595   * @since 5.5.0
1596   *
1597   * @param string $image_src     The image source file.
1598   * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
1599   * @param int    $attachment_id Optional. The image attachment ID. Default 0.
1600   * @return array|false Array with first element being the width and second element being the height,
1601   *                     or false if dimensions cannot be determined.
1602   */
1603  function wp_image_src_get_dimensions( $image_src, $image_meta, $attachment_id = 0 ) {
1604      $dimensions = false;
1605  
1606      // Is it a full size image?
1607      if (
1608          isset( $image_meta['file'] ) &&
1609          strpos( $image_src, wp_basename( $image_meta['file'] ) ) !== false
1610      ) {
1611          $dimensions = array(
1612              (int) $image_meta['width'],
1613              (int) $image_meta['height'],
1614          );
1615      }
1616  
1617      if ( ! $dimensions && ! empty( $image_meta['sizes'] ) ) {
1618          $src_filename = wp_basename( $image_src );
1619  
1620          foreach ( $image_meta['sizes'] as $image_size_data ) {
1621              if ( $src_filename === $image_size_data['file'] ) {
1622                  $dimensions = array(
1623                      (int) $image_size_data['width'],
1624                      (int) $image_size_data['height'],
1625                  );
1626  
1627                  break;
1628              }
1629          }
1630      }
1631  
1632      /**
1633       * Filters the 'wp_image_src_get_dimensions' value.
1634       *
1635       * @since 5.7.0
1636       *
1637       * @param array|false $dimensions    Array with first element being the width
1638       *                                   and second element being the height, or
1639       *                                   false if dimensions could not be determined.
1640       * @param string      $image_src     The image source file.
1641       * @param array       $image_meta    The image meta data as returned by
1642       *                                   'wp_get_attachment_metadata()'.
1643       * @param int         $attachment_id The image attachment ID. Default 0.
1644       */
1645      return apply_filters( 'wp_image_src_get_dimensions', $dimensions, $image_src, $image_meta, $attachment_id );
1646  }
1647  
1648  /**
1649   * Adds 'srcset' and 'sizes' attributes to an existing 'img' element.
1650   *
1651   * @since 4.4.0
1652   *
1653   * @see wp_calculate_image_srcset()
1654   * @see wp_calculate_image_sizes()
1655   *
1656   * @param string $image         An HTML 'img' element to be filtered.
1657   * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
1658   * @param int    $attachment_id Image attachment ID.
1659   * @return string Converted 'img' element with 'srcset' and 'sizes' attributes added.
1660   */
1661  function wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id ) {
1662      // Ensure the image meta exists.
1663      if ( empty( $image_meta['sizes'] ) ) {
1664          return $image;
1665      }
1666  
1667      $image_src         = preg_match( '/src="([^"]+)"/', $image, $match_src ) ? $match_src[1] : '';
1668      list( $image_src ) = explode( '?', $image_src );
1669  
1670      // Return early if we couldn't get the image source.
1671      if ( ! $image_src ) {
1672          return $image;
1673      }
1674  
1675      // Bail early if an image has been inserted and later edited.
1676      if ( preg_match( '/-e[0-9]{13}/', $image_meta['file'], $img_edit_hash ) &&
1677          strpos( wp_basename( $image_src ), $img_edit_hash[0] ) === false ) {
1678  
1679          return $image;
1680      }
1681  
1682      $width  = preg_match( '/ width="([0-9]+)"/', $image, $match_width ) ? (int) $match_width[1] : 0;
1683      $height = preg_match( '/ height="([0-9]+)"/', $image, $match_height ) ? (int) $match_height[1] : 0;
1684  
1685      if ( $width && $height ) {
1686          $size_array = array( $width, $height );
1687      } else {
1688          $size_array = wp_image_src_get_dimensions( $image_src, $image_meta, $attachment_id );
1689          if ( ! $size_array ) {
1690              return $image;
1691          }
1692      }
1693  
1694      $srcset = wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );
1695  
1696      if ( $srcset ) {
1697          // Check if there is already a 'sizes' attribute.
1698          $sizes = strpos( $image, ' sizes=' );
1699  
1700          if ( ! $sizes ) {
1701              $sizes = wp_calculate_image_sizes( $size_array, $image_src, $image_meta, $attachment_id );
1702          }
1703      }
1704  
1705      if ( $srcset && $sizes ) {
1706          // Format the 'srcset' and 'sizes' string and escape attributes.
1707          $attr = sprintf( ' srcset="%s"', esc_attr( $srcset ) );
1708  
1709          if ( is_string( $sizes ) ) {
1710              $attr .= sprintf( ' sizes="%s"', esc_attr( $sizes ) );
1711          }
1712  
1713          // Add the srcset and sizes attributes to the image markup.
1714          return preg_replace( '/<img ([^>]+?)[\/ ]*>/', '<img $1' . $attr . ' />', $image );
1715      }
1716  
1717      return $image;
1718  }
1719  
1720  /**
1721   * Determines whether to add the `loading` attribute to the specified tag in the specified context.
1722   *
1723   * @since 5.5.0
1724   * @since 5.7.0 Now returns `true` by default for `iframe` tags.
1725   *
1726   * @param string $tag_name The tag name.
1727   * @param string $context  Additional context, like the current filter name
1728   *                         or the function name from where this was called.
1729   * @return bool Whether to add the attribute.
1730   */
1731  function wp_lazy_loading_enabled( $tag_name, $context ) {
1732      // By default add to all 'img' and 'iframe' tags.
1733      // See https://html.spec.whatwg.org/multipage/embedded-content.html#attr-img-loading
1734      // See https://html.spec.whatwg.org/multipage/iframe-embed-object.html#attr-iframe-loading
1735      $default = ( 'img' === $tag_name || 'iframe' === $tag_name );
1736  
1737      /**
1738       * Filters whether to add the `loading` attribute to the specified tag in the specified context.
1739       *
1740       * @since 5.5.0
1741       *
1742       * @param bool   $default  Default value.
1743       * @param string $tag_name The tag name.
1744       * @param string $context  Additional context, like the current filter name
1745       *                         or the function name from where this was called.
1746       */
1747      return (bool) apply_filters( 'wp_lazy_loading_enabled', $default, $tag_name, $context );
1748  }
1749  
1750  /**
1751   * Filters specific tags in post content and modifies their markup.
1752   *
1753   * Modifies HTML tags in post content to include new browser and HTML technologies
1754   * that may not have existed at the time of post creation. These modifications currently
1755   * include adding `srcset`, `sizes`, and `loading` attributes to `img` HTML tags, as well
1756   * as adding `loading` attributes to `iframe` HTML tags.
1757   * Future similar optimizations should be added/expected here.
1758   *
1759   * @since 5.5.0
1760   * @since 5.7.0 Now supports adding `loading` attributes to `iframe` tags.
1761   *
1762   * @see wp_img_tag_add_width_and_height_attr()
1763   * @see wp_img_tag_add_srcset_and_sizes_attr()
1764   * @see wp_img_tag_add_loading_attr()
1765   * @see wp_iframe_tag_add_loading_attr()
1766   *
1767   * @param string $content The HTML content to be filtered.
1768   * @param string $context Optional. Additional context to pass to the filters.
1769   *                        Defaults to `current_filter()` when not set.
1770   * @return string Converted content with images modified.
1771   */
1772  function wp_filter_content_tags( $content, $context = null ) {
1773      if ( null === $context ) {
1774          $context = current_filter();
1775      }
1776  
1777      $add_img_loading_attr    = wp_lazy_loading_enabled( 'img', $context );
1778      $add_iframe_loading_attr = wp_lazy_loading_enabled( 'iframe', $context );
1779  
1780      if ( ! preg_match_all( '/<(img|iframe)\s[^>]+>/', $content, $matches, PREG_SET_ORDER ) ) {
1781          return $content;
1782      }
1783  
1784      // List of the unique `img` tags found in $content.
1785      $images = array();
1786  
1787      // List of the unique `iframe` tags found in $content.
1788      $iframes = array();
1789  
1790      foreach ( $matches as $match ) {
1791          list( $tag, $tag_name ) = $match;
1792  
1793          switch ( $tag_name ) {
1794              case 'img':
1795                  if ( preg_match( '/wp-image-([0-9]+)/i', $tag, $class_id ) ) {
1796                      $attachment_id = absint( $class_id[1] );
1797  
1798                      if ( $attachment_id ) {
1799                          // If exactly the same image tag is used more than once, overwrite it.
1800                          // All identical tags will be replaced later with 'str_replace()'.
1801                          $images[ $tag ] = $attachment_id;
1802                          break;
1803                      }
1804                  }
1805                  $images[ $tag ] = 0;
1806                  break;
1807              case 'iframe':
1808                  $iframes[ $tag ] = 0;
1809                  break;
1810          }
1811      }
1812  
1813      // Reduce the array to unique attachment IDs.
1814      $attachment_ids = array_unique( array_filter( array_values( $images ) ) );
1815  
1816      if ( count( $attachment_ids ) > 1 ) {
1817          /*
1818           * Warm the object cache with post and meta information for all found
1819           * images to avoid making individual database calls.
1820           */
1821          _prime_post_caches( $attachment_ids, false, true );
1822      }
1823  
1824      // Iterate through the matches in order of occurrence as it is relevant for whether or not to lazy-load.
1825      foreach ( $matches as $match ) {
1826          // Filter an image match.
1827          if ( isset( $images[ $match[0] ] ) ) {
1828              $filtered_image = $match[0];
1829              $attachment_id  = $images[ $match[0] ];
1830  
1831              // Add 'width' and 'height' attributes if applicable.
1832              if ( $attachment_id > 0 && false === strpos( $filtered_image, ' width=' ) && false === strpos( $filtered_image, ' height=' ) ) {
1833                  $filtered_image = wp_img_tag_add_width_and_height_attr( $filtered_image, $context, $attachment_id );
1834              }
1835  
1836              // Add 'srcset' and 'sizes' attributes if applicable.
1837              if ( $attachment_id > 0 && false === strpos( $filtered_image, ' srcset=' ) ) {
1838                  $filtered_image = wp_img_tag_add_srcset_and_sizes_attr( $filtered_image, $context, $attachment_id );
1839              }
1840  
1841              // Add 'loading' attribute if applicable.
1842              if ( $add_img_loading_attr && false === strpos( $filtered_image, ' loading=' ) ) {
1843                  $filtered_image = wp_img_tag_add_loading_attr( $filtered_image, $context );
1844              }
1845  
1846              /**
1847               * Filters an img tag within the content for a given context.
1848               *
1849               * @since 6.0.0
1850               *
1851               * @param string $filtered_image Full img tag with attributes that will replace the source img tag.
1852               * @param string $context        Additional context, like the current filter name or the function name from where this was called.
1853               * @param int    $attachment_id  The image attachment ID. May be 0 in case the image is not an attachment.
1854               */
1855              $filtered_image = apply_filters( 'wp_content_img_tag', $filtered_image, $context, $attachment_id );
1856  
1857              if ( $filtered_image !== $match[0] ) {
1858                  $content = str_replace( $match[0], $filtered_image, $content );
1859              }
1860  
1861              /*
1862               * Unset image lookup to not run the same logic again unnecessarily if the same image tag is used more than
1863               * once in the same blob of content.
1864               */
1865              unset( $images[ $match[0] ] );
1866          }
1867  
1868          // Filter an iframe match.
1869          if ( isset( $iframes[ $match[0] ] ) ) {
1870              $filtered_iframe = $match[0];
1871  
1872              // Add 'loading' attribute if applicable.
1873              if ( $add_iframe_loading_attr && false === strpos( $filtered_iframe, ' loading=' ) ) {
1874                  $filtered_iframe = wp_iframe_tag_add_loading_attr( $filtered_iframe, $context );
1875              }
1876  
1877              if ( $filtered_iframe !== $match[0] ) {
1878                  $content = str_replace( $match[0], $filtered_iframe, $content );
1879              }
1880  
1881              /*
1882               * Unset iframe lookup to not run the same logic again unnecessarily if the same iframe tag is used more
1883               * than once in the same blob of content.
1884               */
1885              unset( $iframes[ $match[0] ] );
1886          }
1887      }
1888  
1889      return $content;
1890  }
1891  
1892  /**
1893   * Adds `loading` attribute to an `img` HTML tag.
1894   *
1895   * @since 5.5.0
1896   *
1897   * @param string $image   The HTML `img` tag where the attribute should be added.
1898   * @param string $context Additional context to pass to the filters.
1899   * @return string Converted `img` tag with `loading` attribute added.
1900   */
1901  function wp_img_tag_add_loading_attr( $image, $context ) {
1902      // Get loading attribute value to use. This must occur before the conditional check below so that even images that
1903      // are ineligible for being lazy-loaded are considered.
1904      $value = wp_get_loading_attr_default( $context );
1905  
1906      // Images should have source and dimension attributes for the `loading` attribute to be added.
1907      if ( false === strpos( $image, ' src="' ) || false === strpos( $image, ' width="' ) || false === strpos( $image, ' height="' ) ) {
1908          return $image;
1909      }
1910  
1911      /**
1912       * Filters the `loading` attribute value to add to an image. Default `lazy`.
1913       *
1914       * Returning `false` or an empty string will not add the attribute.
1915       * Returning `true` will add the default value.
1916       *
1917       * @since 5.5.0
1918       *
1919       * @param string|bool $value   The `loading` attribute value. Returning a falsey value will result in
1920       *                             the attribute being omitted for the image.
1921       * @param string      $image   The HTML `img` tag to be filtered.
1922       * @param string      $context Additional context about how the function was called or where the img tag is.
1923       */
1924      $value = apply_filters( 'wp_img_tag_add_loading_attr', $value, $image, $context );
1925  
1926      if ( $value ) {
1927          if ( ! in_array( $value, array( 'lazy', 'eager' ), true ) ) {
1928              $value = 'lazy';
1929          }
1930  
1931          return str_replace( '<img', '<img loading="' . esc_attr( $value ) . '"', $image );
1932      }
1933  
1934      return $image;
1935  }
1936  
1937  /**
1938   * Adds `width` and `height` attributes to an `img` HTML tag.
1939   *
1940   * @since 5.5.0
1941   *
1942   * @param string $image         The HTML `img` tag where the attribute should be added.
1943   * @param string $context       Additional context to pass to the filters.
1944   * @param int    $attachment_id Image attachment ID.
1945   * @return string Converted 'img' element with 'width' and 'height' attributes added.
1946   */
1947  function wp_img_tag_add_width_and_height_attr( $image, $context, $attachment_id ) {
1948      $image_src         = preg_match( '/src="([^"]+)"/', $image, $match_src ) ? $match_src[1] : '';
1949      list( $image_src ) = explode( '?', $image_src );
1950  
1951      // Return early if we couldn't get the image source.
1952      if ( ! $image_src ) {
1953          return $image;
1954      }
1955  
1956      /**
1957       * Filters whether to add the missing `width` and `height` HTML attributes to the img tag. Default `true`.
1958       *
1959       * Returning anything else than `true` will not add the attributes.
1960       *
1961       * @since 5.5.0
1962       *
1963       * @param bool   $value         The filtered value, defaults to `true`.
1964       * @param string $image         The HTML `img` tag where the attribute should be added.
1965       * @param string $context       Additional context about how the function was called or where the img tag is.
1966       * @param int    $attachment_id The image attachment ID.
1967       */
1968      $add = apply_filters( 'wp_img_tag_add_width_and_height_attr', true, $image, $context, $attachment_id );
1969  
1970      if ( true === $add ) {
1971          $image_meta = wp_get_attachment_metadata( $attachment_id );
1972          $size_array = wp_image_src_get_dimensions( $image_src, $image_meta, $attachment_id );
1973  
1974          if ( $size_array ) {
1975              $hw = trim( image_hwstring( $size_array[0], $size_array[1] ) );
1976              return str_replace( '<img', "<img {$hw}", $image );
1977          }
1978      }
1979  
1980      return $image;
1981  }
1982  
1983  /**
1984   * Adds `srcset` and `sizes` attributes to an existing `img` HTML tag.
1985   *
1986   * @since 5.5.0
1987   *
1988   * @param string $image         The HTML `img` tag where the attribute should be added.
1989   * @param string $context       Additional context to pass to the filters.
1990   * @param int    $attachment_id Image attachment ID.
1991   * @return string Converted 'img' element with 'loading' attribute added.
1992   */
1993  function wp_img_tag_add_srcset_and_sizes_attr( $image, $context, $attachment_id ) {
1994      /**
1995       * Filters whether to add the `srcset` and `sizes` HTML attributes to the img tag. Default `true`.
1996       *
1997       * Returning anything else than `true` will not add the attributes.
1998       *
1999       * @since 5.5.0
2000       *
2001       * @param bool   $value         The filtered value, defaults to `true`.
2002       * @param string $image         The HTML `img` tag where the attribute should be added.
2003       * @param string $context       Additional context about how the function was called or where the img tag is.
2004       * @param int    $attachment_id The image attachment ID.
2005       */
2006      $add = apply_filters( 'wp_img_tag_add_srcset_and_sizes_attr', true, $image, $context, $attachment_id );
2007  
2008      if ( true === $add ) {
2009          $image_meta = wp_get_attachment_metadata( $attachment_id );
2010          return wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id );
2011      }
2012  
2013      return $image;
2014  }
2015  
2016  /**
2017   * Adds `loading` attribute to an `iframe` HTML tag.
2018   *
2019   * @since 5.7.0
2020   *
2021   * @param string $iframe  The HTML `iframe` tag where the attribute should be added.
2022   * @param string $context Additional context to pass to the filters.
2023   * @return string Converted `iframe` tag with `loading` attribute added.
2024   */
2025  function wp_iframe_tag_add_loading_attr( $iframe, $context ) {
2026      // Iframes with fallback content (see `wp_filter_oembed_result()`) should not be lazy-loaded because they are
2027      // visually hidden initially.
2028      if ( false !== strpos( $iframe, ' data-secret="' ) ) {
2029          return $iframe;
2030      }
2031  
2032      // Get loading attribute value to use. This must occur before the conditional check below so that even iframes that
2033      // are ineligible for being lazy-loaded are considered.
2034      $value = wp_get_loading_attr_default( $context );
2035  
2036      // Iframes should have source and dimension attributes for the `loading` attribute to be added.
2037      if ( false === strpos( $iframe, ' src="' ) || false === strpos( $iframe, ' width="' ) || false === strpos( $iframe, ' height="' ) ) {
2038          return $iframe;
2039      }
2040  
2041      /**
2042       * Filters the `loading` attribute value to add to an iframe. Default `lazy`.
2043       *
2044       * Returning `false` or an empty string will not add the attribute.
2045       * Returning `true` will add the default value.
2046       *
2047       * @since 5.7.0
2048       *
2049       * @param string|bool $value   The `loading` attribute value. Returning a falsey value will result in
2050       *                             the attribute being omitted for the iframe.
2051       * @param string      $iframe  The HTML `iframe` tag to be filtered.
2052       * @param string      $context Additional context about how the function was called or where the iframe tag is.
2053       */
2054      $value = apply_filters( 'wp_iframe_tag_add_loading_attr', $value, $iframe, $context );
2055  
2056      if ( $value ) {
2057          if ( ! in_array( $value, array( 'lazy', 'eager' ), true ) ) {
2058              $value = 'lazy';
2059          }
2060  
2061          return str_replace( '<iframe', '<iframe loading="' . esc_attr( $value ) . '"', $iframe );
2062      }
2063  
2064      return $iframe;
2065  }
2066  
2067  /**
2068   * Adds a 'wp-post-image' class to post thumbnails. Internal use only.
2069   *
2070   * Uses the {@see 'begin_fetch_post_thumbnail_html'} and {@see 'end_fetch_post_thumbnail_html'}
2071   * action hooks to dynamically add/remove itself so as to only filter post thumbnails.
2072   *
2073   * @ignore
2074   * @since 2.9.0
2075   *
2076   * @param string[] $attr Array of thumbnail attributes including src, class, alt, title, keyed by attribute name.
2077   * @return string[] Modified array of attributes including the new 'wp-post-image' class.
2078   */
2079  function _wp_post_thumbnail_class_filter( $attr ) {
2080      $attr['class'] .= ' wp-post-image';
2081      return $attr;
2082  }
2083  
2084  /**
2085   * Adds '_wp_post_thumbnail_class_filter' callback to the 'wp_get_attachment_image_attributes'
2086   * filter hook. Internal use only.
2087   *
2088   * @ignore
2089   * @since 2.9.0
2090   *
2091   * @param string[] $attr Array of thumbnail attributes including src, class, alt, title, keyed by attribute name.
2092   */
2093  function _wp_post_thumbnail_class_filter_add( $attr ) {
2094      add_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
2095  }
2096  
2097  /**
2098   * Removes the '_wp_post_thumbnail_class_filter' callback from the 'wp_get_attachment_image_attributes'
2099   * filter hook. Internal use only.
2100   *
2101   * @ignore
2102   * @since 2.9.0
2103   *
2104   * @param string[] $attr Array of thumbnail attributes including src, class, alt, title, keyed by attribute name.
2105   */
2106  function _wp_post_thumbnail_class_filter_remove( $attr ) {
2107      remove_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
2108  }
2109  
2110  add_shortcode( 'wp_caption', 'img_caption_shortcode' );
2111  add_shortcode( 'caption', 'img_caption_shortcode' );
2112  
2113  /**
2114   * Builds the Caption shortcode output.
2115   *
2116   * Allows a plugin to replace the content that would otherwise be returned. The
2117   * filter is {@see 'img_caption_shortcode'} and passes an empty string, the attr
2118   * parameter and the content parameter values.
2119   *
2120   * The supported attributes for the shortcode are 'id', 'caption_id', 'align',
2121   * 'width', 'caption', and 'class'.
2122   *
2123   * @since 2.6.0
2124   * @since 3.9.0 The `class` attribute was added.
2125   * @since 5.1.0 The `caption_id` attribute was added.
2126   * @since 5.9.0 The `$content` parameter default value changed from `null` to `''`.
2127   *
2128   * @param array  $attr {
2129   *     Attributes of the caption shortcode.
2130   *
2131   *     @type string $id         ID of the image and caption container element, i.e. `<figure>` or `<div>`.
2132   *     @type string $caption_id ID of the caption element, i.e. `<figcaption>` or `<p>`.
2133   *     @type string $align      Class name that aligns the caption. Default 'alignnone'. Accepts 'alignleft',
2134   *                              'aligncenter', alignright', 'alignnone'.
2135   *     @type int    $width      The width of the caption, in pixels.
2136   *     @type string $caption    The caption text.
2137   *     @type string $class      Additional class name(s) added to the caption container.
2138   * }
2139   * @param string $content Optional. Shortcode content. Default empty string.
2140   * @return string HTML content to display the caption.
2141   */
2142  function img_caption_shortcode( $attr, $content = '' ) {
2143      // New-style shortcode with the caption inside the shortcode with the link and image tags.
2144      if ( ! isset( $attr['caption'] ) ) {
2145          if ( preg_match( '#((?:<a [^>]+>\s*)?<img [^>]+>(?:\s*</a>)?)(.*)#is', $content, $matches ) ) {
2146              $content         = $matches[1];
2147              $attr['caption'] = trim( $matches[2] );
2148          }
2149      } elseif ( strpos( $attr['caption'], '<' ) !== false ) {
2150          $attr['caption'] = wp_kses( $attr['caption'], 'post' );
2151      }
2152  
2153      /**
2154       * Filters the default caption shortcode output.
2155       *
2156       * If the filtered output isn't empty, it will be used instead of generating
2157       * the default caption template.
2158       *
2159       * @since 2.6.0
2160       *
2161       * @see img_caption_shortcode()
2162       *
2163       * @param string $output  The caption output. Default empty.
2164       * @param array  $attr    Attributes of the caption shortcode.
2165       * @param string $content The image element, possibly wrapped in a hyperlink.
2166       */
2167      $output = apply_filters( 'img_caption_shortcode', '', $attr, $content );
2168  
2169      if ( ! empty( $output ) ) {
2170          return $output;
2171      }
2172  
2173      $atts = shortcode_atts(
2174          array(
2175              'id'         => '',
2176              'caption_id' => '',
2177              'align'      => 'alignnone',
2178              'width'      => '',
2179              'caption'    => '',
2180              'class'      => '',
2181          ),
2182          $attr,
2183          'caption'
2184      );
2185  
2186      $atts['width'] = (int) $atts['width'];
2187  
2188      if ( $atts['width'] < 1 || empty( $atts['caption'] ) ) {
2189          return $content;
2190      }
2191  
2192      $id          = '';
2193      $caption_id  = '';
2194      $describedby = '';
2195  
2196      if ( $atts['id'] ) {
2197          $atts['id'] = sanitize_html_class( $atts['id'] );
2198          $id         = 'id="' . esc_attr( $atts['id'] ) . '" ';
2199      }
2200  
2201      if ( $atts['caption_id'] ) {
2202          $atts['caption_id'] = sanitize_html_class( $atts['caption_id'] );
2203      } elseif ( $atts['id'] ) {
2204          $atts['caption_id'] = 'caption-' . str_replace( '_', '-', $atts['id'] );
2205      }
2206  
2207      if ( $atts['caption_id'] ) {
2208          $caption_id  = 'id="' . esc_attr( $atts['caption_id'] ) . '" ';
2209          $describedby = 'aria-describedby="' . esc_attr( $atts['caption_id'] ) . '" ';
2210      }
2211  
2212      $class = trim( 'wp-caption ' . $atts['align'] . ' ' . $atts['class'] );
2213  
2214      $html5 = current_theme_supports( 'html5', 'caption' );
2215      // HTML5 captions never added the extra 10px to the image width.
2216      $width = $html5 ? $atts['width'] : ( 10 + $atts['width'] );
2217  
2218      /**
2219       * Filters the width of an image's caption.
2220       *
2221       * By default, the caption is 10 pixels greater than the width of the image,
2222       * to prevent post content from running up against a floated image.
2223       *
2224       * @since 3.7.0
2225       *
2226       * @see img_caption_shortcode()
2227       *
2228       * @param int    $width    Width of the caption in pixels. To remove this inline style,
2229       *                         return zero.
2230       * @param array  $atts     Attributes of the caption shortcode.
2231       * @param string $content  The image element, possibly wrapped in a hyperlink.
2232       */
2233      $caption_width = apply_filters( 'img_caption_shortcode_width', $width, $atts, $content );
2234  
2235      $style = '';
2236  
2237      if ( $caption_width ) {
2238          $style = 'style="width: ' . (int) $caption_width . 'px" ';
2239      }
2240  
2241      if ( $html5 ) {
2242          $html = sprintf(
2243              '<figure %s%s%sclass="%s">%s%s</figure>',
2244              $id,
2245              $describedby,
2246              $style,
2247              esc_attr( $class ),
2248              do_shortcode( $content ),
2249              sprintf(
2250                  '<figcaption %sclass="wp-caption-text">%s</figcaption>',
2251                  $caption_id,
2252                  $atts['caption']
2253              )
2254          );
2255      } else {
2256          $html = sprintf(
2257              '<div %s%sclass="%s">%s%s</div>',
2258              $id,
2259              $style,
2260              esc_attr( $class ),
2261              str_replace( '<img ', '<img ' . $describedby, do_shortcode( $content ) ),
2262              sprintf(
2263                  '<p %sclass="wp-caption-text">%s</p>',
2264                  $caption_id,
2265                  $atts['caption']
2266              )
2267          );
2268      }
2269  
2270      return $html;
2271  }
2272  
2273  add_shortcode( 'gallery', 'gallery_shortcode' );
2274  
2275  /**
2276   * Builds the Gallery shortcode output.
2277   *
2278   * This implements the functionality of the Gallery Shortcode for displaying
2279   * WordPress images on a post.
2280   *
2281   * @since 2.5.0
2282   *
2283   * @param array $attr {
2284   *     Attributes of the gallery shortcode.
2285   *
2286   *     @type string       $order      Order of the images in the gallery. Default 'ASC'. Accepts 'ASC', 'DESC'.
2287   *     @type string       $orderby    The field to use when ordering the images. Default 'menu_order ID'.
2288   *                                    Accepts any valid SQL ORDERBY statement.
2289   *     @type int          $id         Post ID.
2290   *     @type string       $itemtag    HTML tag to use for each image in the gallery.
2291   *                                    Default 'dl', or 'figure' when the theme registers HTML5 gallery support.
2292   *     @type string       $icontag    HTML tag to use for each image's icon.
2293   *                                    Default 'dt', or 'div' when the theme registers HTML5 gallery support.
2294   *     @type string       $captiontag HTML tag to use for each image's caption.
2295   *                                    Default 'dd', or 'figcaption' when the theme registers HTML5 gallery support.
2296   *     @type int          $columns    Number of columns of images to display. Default 3.
2297   *     @type string|int[] $size       Size of the images to display. Accepts any registered image size name, or an array
2298   *                                    of width and height values in pixels (in that order). Default 'thumbnail'.
2299   *     @type string       $ids        A comma-separated list of IDs of attachments to display. Default empty.
2300   *     @type string       $include    A comma-separated list of IDs of attachments to include. Default empty.
2301   *     @type string       $exclude    A comma-separated list of IDs of attachments to exclude. Default empty.
2302   *     @type string       $link       What to link each image to. Default empty (links to the attachment page).
2303   *                                    Accepts 'file', 'none'.
2304   * }
2305   * @return string HTML content to display gallery.
2306   */
2307  function gallery_shortcode( $attr ) {
2308      $post = get_post();
2309  
2310      static $instance = 0;
2311      $instance++;
2312  
2313      if ( ! empty( $attr['ids'] ) ) {
2314          // 'ids' is explicitly ordered, unless you specify otherwise.
2315          if ( empty( $attr['orderby'] ) ) {
2316              $attr['orderby'] = 'post__in';
2317          }
2318          $attr['include'] = $attr['ids'];
2319      }
2320  
2321      /**
2322       * Filters the default gallery shortcode output.
2323       *
2324       * If the filtered output isn't empty, it will be used instead of generating
2325       * the default gallery template.
2326       *
2327       * @since 2.5.0
2328       * @since 4.2.0 The `$instance` parameter was added.
2329       *
2330       * @see gallery_shortcode()
2331       *
2332       * @param string $output   The gallery output. Default empty.
2333       * @param array  $attr     Attributes of the gallery shortcode.
2334       * @param int    $instance Unique numeric ID of this gallery shortcode instance.
2335       */
2336      $output = apply_filters( 'post_gallery', '', $attr, $instance );
2337  
2338      if ( ! empty( $output ) ) {
2339          return $output;
2340      }
2341  
2342      $html5 = current_theme_supports( 'html5', 'gallery' );
2343      $atts  = shortcode_atts(
2344          array(
2345              'order'      => 'ASC',
2346              'orderby'    => 'menu_order ID',
2347              'id'         => $post ? $post->ID : 0,
2348              'itemtag'    => $html5 ? 'figure' : 'dl',
2349              'icontag'    => $html5 ? 'div' : 'dt',
2350              'captiontag' => $html5 ? 'figcaption' : 'dd',
2351              'columns'    => 3,
2352              'size'       => 'thumbnail',
2353              'include'    => '',
2354              'exclude'    => '',
2355              'link'       => '',
2356          ),
2357          $attr,
2358          'gallery'
2359      );
2360  
2361      $id = (int) $atts['id'];
2362  
2363      if ( ! empty( $atts['include'] ) ) {
2364          $_attachments = get_posts(
2365              array(
2366                  'include'        => $atts['include'],
2367                  'post_status'    => 'inherit',
2368                  'post_type'      => 'attachment',
2369                  'post_mime_type' => 'image',
2370                  'order'          => $atts['order'],
2371                  'orderby'        => $atts['orderby'],
2372              )
2373          );
2374  
2375          $attachments = array();
2376          foreach ( $_attachments as $key => $val ) {
2377              $attachments[ $val->ID ] = $_attachments[ $key ];
2378          }
2379      } elseif ( ! empty( $atts['exclude'] ) ) {
2380          $attachments = get_children(
2381              array(
2382                  'post_parent'    => $id,
2383                  'exclude'        => $atts['exclude'],
2384                  'post_status'    => 'inherit',
2385                  'post_type'      => 'attachment',
2386                  'post_mime_type' => 'image',
2387                  'order'          => $atts['order'],
2388                  'orderby'        => $atts['orderby'],
2389              )
2390          );
2391      } else {
2392          $attachments = get_children(
2393              array(
2394                  'post_parent'    => $id,
2395                  'post_status'    => 'inherit',
2396                  'post_type'      => 'attachment',
2397                  'post_mime_type' => 'image',
2398                  'order'          => $atts['order'],
2399                  'orderby'        => $atts['orderby'],
2400              )
2401          );
2402      }
2403  
2404      if ( empty( $attachments ) ) {
2405          return '';
2406      }
2407  
2408      if ( is_feed() ) {
2409          $output = "\n";
2410          foreach ( $attachments as $att_id => $attachment ) {
2411              if ( ! empty( $atts['link'] ) ) {
2412                  if ( 'none' === $atts['link'] ) {
2413                      $output .= wp_get_attachment_image( $att_id, $atts['size'], false, $attr );
2414                  } else {
2415                      $output .= wp_get_attachment_link( $att_id, $atts['size'], false );
2416                  }
2417              } else {
2418                  $output .= wp_get_attachment_link( $att_id, $atts['size'], true );
2419              }
2420              $output .= "\n";
2421          }
2422          return $output;
2423      }
2424  
2425      $itemtag    = tag_escape( $atts['itemtag'] );
2426      $captiontag = tag_escape( $atts['captiontag'] );
2427      $icontag    = tag_escape( $atts['icontag'] );
2428      $valid_tags = wp_kses_allowed_html( 'post' );
2429      if ( ! isset( $valid_tags[ $itemtag ] ) ) {
2430          $itemtag = 'dl';
2431      }
2432      if ( ! isset( $valid_tags[ $captiontag ] ) ) {
2433          $captiontag = 'dd';
2434      }
2435      if ( ! isset( $valid_tags[ $icontag ] ) ) {
2436          $icontag = 'dt';
2437      }
2438  
2439      $columns   = (int) $atts['columns'];
2440      $itemwidth = $columns > 0 ? floor( 100 / $columns ) : 100;
2441      $float     = is_rtl() ? 'right' : 'left';
2442  
2443      $selector = "gallery-{$instance}";
2444  
2445      $gallery_style = '';
2446  
2447      /**
2448       * Filters whether to print default gallery styles.
2449       *
2450       * @since 3.1.0
2451       *
2452       * @param bool $print Whether to print default gallery styles.
2453       *                    Defaults to false if the theme supports HTML5 galleries.
2454       *                    Otherwise, defaults to true.
2455       */
2456      if ( apply_filters( 'use_default_gallery_style', ! $html5 ) ) {
2457          $type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
2458  
2459          $gallery_style = "
2460          <style{$type_attr}>
2461              #{$selector} {
2462                  margin: auto;
2463              }
2464              #{$selector} .gallery-item {
2465                  float: {$float};
2466                  margin-top: 10px;
2467                  text-align: center;
2468                  width: {$itemwidth}%;
2469              }
2470              #{$selector} img {
2471                  border: 2px solid #cfcfcf;
2472              }
2473              #{$selector} .gallery-caption {
2474                  margin-left: 0;
2475              }
2476              /* see gallery_shortcode() in wp-includes/media.php */
2477          </style>\n\t\t";
2478      }
2479  
2480      $size_class  = sanitize_html_class( is_array( $atts['size'] ) ? implode( 'x', $atts['size'] ) : $atts['size'] );
2481      $gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";
2482  
2483      /**
2484       * Filters the default gallery shortcode CSS styles.
2485       *
2486       * @since 2.5.0
2487       *
2488       * @param string $gallery_style Default CSS styles and opening HTML div container
2489       *                              for the gallery shortcode output.
2490       */
2491      $output = apply_filters( 'gallery_style', $gallery_style . $gallery_div );
2492  
2493      $i = 0;
2494  
2495      foreach ( $attachments as $id => $attachment ) {
2496  
2497          $attr = ( trim( $attachment->post_excerpt ) ) ? array( 'aria-describedby' => "$selector-$id" ) : '';
2498  
2499          if ( ! empty( $atts['link'] ) && 'file' === $atts['link'] ) {
2500              $image_output = wp_get_attachment_link( $id, $atts['size'], false, false, false, $attr );
2501          } elseif ( ! empty( $atts['link'] ) && 'none' === $atts['link'] ) {
2502              $image_output = wp_get_attachment_image( $id, $atts['size'], false, $attr );
2503          } else {
2504              $image_output = wp_get_attachment_link( $id, $atts['size'], true, false, false, $attr );
2505          }
2506  
2507          $image_meta = wp_get_attachment_metadata( $id );
2508  
2509          $orientation = '';
2510  
2511          if ( isset( $image_meta['height'], $image_meta['width'] ) ) {
2512              $orientation = ( $image_meta['height'] > $image_meta['width'] ) ? 'portrait' : 'landscape';
2513          }
2514  
2515          $output .= "<{$itemtag} class='gallery-item'>";
2516          $output .= "
2517              <{$icontag} class='gallery-icon {$orientation}'>
2518                  $image_output
2519              </{$icontag}>";
2520  
2521          if ( $captiontag && trim( $attachment->post_excerpt ) ) {
2522              $output .= "
2523                  <{$captiontag} class='wp-caption-text gallery-caption' id='$selector-$id'>
2524                  " . wptexturize( $attachment->post_excerpt ) . "
2525                  </{$captiontag}>";
2526          }
2527  
2528          $output .= "</{$itemtag}>";
2529  
2530          if ( ! $html5 && $columns > 0 && 0 === ++$i % $columns ) {
2531              $output .= '<br style="clear: both" />';
2532          }
2533      }
2534  
2535      if ( ! $html5 && $columns > 0 && 0 !== $i % $columns ) {
2536          $output .= "
2537              <br style='clear: both' />";
2538      }
2539  
2540      $output .= "
2541          </div>\n";
2542  
2543      return $output;
2544  }
2545  
2546  /**
2547   * Outputs the templates used by playlists.
2548   *
2549   * @since 3.9.0
2550   */
2551  function wp_underscore_playlist_templates() {
2552      ?>
2553  <script type="text/html" id="tmpl-wp-playlist-current-item">
2554      <# if ( data.thumb && data.thumb.src ) { #>
2555          <img src="{{ data.thumb.src }}" alt="" />
2556      <# } #>
2557      <div class="wp-playlist-caption">
2558          <span class="wp-playlist-item-meta wp-playlist-item-title">
2559          <?php
2560              /* translators: %s: Playlist item title. */
2561              printf( _x( '&#8220;%s&#8221;', 'playlist item title' ), '{{ data.title }}' );
2562          ?>
2563          </span>
2564          <# if ( data.meta.album ) { #><span class="wp-playlist-item-meta wp-playlist-item-album">{{ data.meta.album }}</span><# } #>
2565          <# if ( data.meta.artist ) { #><span class="wp-playlist-item-meta wp-playlist-item-artist">{{ data.meta.artist }}</span><# } #>
2566      </div>
2567  </script>
2568  <script type="text/html" id="tmpl-wp-playlist-item">
2569      <div class="wp-playlist-item">
2570          <a class="wp-playlist-caption" href="{{ data.src }}">
2571              {{ data.index ? ( data.index + '. ' ) : '' }}
2572              <# if ( data.caption ) { #>
2573                  {{ data.caption }}
2574              <# } else { #>
2575                  <span class="wp-playlist-item-title">
2576                  <?php
2577                      /* translators: %s: Playlist item title. */
2578                      printf( _x( '&#8220;%s&#8221;', 'playlist item title' ), '{{{ data.title }}}' );
2579                  ?>
2580                  </span>
2581                  <# if ( data.artists && data.meta.artist ) { #>
2582                  <span class="wp-playlist-item-artist"> &mdash; {{ data.meta.artist }}</span>
2583                  <# } #>
2584              <# } #>
2585          </a>
2586          <# if ( data.meta.length_formatted ) { #>
2587          <div class="wp-playlist-item-length">{{ data.meta.length_formatted }}</div>
2588          <# } #>
2589      </div>
2590  </script>
2591      <?php
2592  }
2593  
2594  /**
2595   * Outputs and enqueue default scripts and styles for playlists.
2596   *
2597   * @since 3.9.0
2598   *
2599   * @param string $type Type of playlist. Accepts 'audio' or 'video'.
2600   */
2601  function wp_playlist_scripts( $type ) {
2602      wp_enqueue_style( 'wp-mediaelement' );
2603      wp_enqueue_script( 'wp-playlist' );
2604      ?>
2605  <!--[if lt IE 9]><script>document.createElement('<?php echo esc_js( $type ); ?>');</script><![endif]-->
2606      <?php
2607      add_action( 'wp_footer', 'wp_underscore_playlist_templates', 0 );
2608      add_action( 'admin_footer', 'wp_underscore_playlist_templates', 0 );
2609  }
2610  
2611  /**
2612   * Builds the Playlist shortcode output.
2613   *
2614   * This implements the functionality of the playlist shortcode for displaying
2615   * a collection of WordPress audio or video files in a post.
2616   *
2617   * @since 3.9.0
2618   *
2619   * @global int $content_width
2620   *
2621   * @param array $attr {
2622   *     Array of default playlist attributes.
2623   *
2624   *     @type string  $type         Type of playlist to display. Accepts 'audio' or 'video'. Default 'audio'.
2625   *     @type string  $order        Designates ascending or descending order of items in the playlist.
2626   *                                 Accepts 'ASC', 'DESC'. Default 'ASC'.
2627   *     @type string  $orderby      Any column, or columns, to sort the playlist. If $ids are
2628   *                                 passed, this defaults to the order of the $ids array ('post__in').
2629   *                                 Otherwise default is 'menu_order ID'.
2630   *     @type int     $id           If an explicit $ids array is not present, this parameter
2631   *                                 will determine which attachments are used for the playlist.
2632   *                                 Default is the current post ID.
2633   *     @type array   $ids          Create a playlist out of these explicit attachment IDs. If empty,
2634   *                                 a playlist will be created from all $type attachments of $id.
2635   *                                 Default empty.
2636   *     @type array   $exclude      List of specific attachment IDs to exclude from the playlist. Default empty.
2637   *     @type string  $style        Playlist style to use. Accepts 'light' or 'dark'. Default 'light'.
2638   *     @type bool    $tracklist    Whether to show or hide the playlist. Default true.
2639   *     @type bool    $tracknumbers Whether to show or hide the numbers next to entries in the playlist. Default true.
2640   *     @type bool    $images       Show or hide the video or audio thumbnail (Featured Image/post
2641   *                                 thumbnail). Default true.
2642   *     @type bool    $artists      Whether to show or hide artist name in the playlist. Default true.
2643   * }
2644   *
2645   * @return string Playlist output. Empty string if the passed type is unsupported.
2646   */
2647  function wp_playlist_shortcode( $attr ) {
2648      global $content_width;
2649      $post = get_post();
2650  
2651      static $instance = 0;
2652      $instance++;
2653  
2654      if ( ! empty( $attr['ids'] ) ) {
2655          // 'ids' is explicitly ordered, unless you specify otherwise.
2656          if ( empty( $attr['orderby'] ) ) {
2657              $attr['orderby'] = 'post__in';
2658          }
2659          $attr['include'] = $attr['ids'];
2660      }
2661  
2662      /**
2663       * Filters the playlist output.
2664       *
2665       * Returning a non-empty value from the filter will short-circuit generation
2666       * of the default playlist output, returning the passed value instead.
2667       *
2668       * @since 3.9.0
2669       * @since 4.2.0 The `$instance` parameter was added.
2670       *
2671       * @param string $output   Playlist output. Default empty.
2672       * @param array  $attr     An array of shortcode attributes.
2673       * @param int    $instance Unique numeric ID of this playlist shortcode instance.
2674       */
2675      $output = apply_filters( 'post_playlist', '', $attr, $instance );
2676  
2677      if ( ! empty( $output ) ) {
2678          return $output;
2679      }
2680  
2681      $atts = shortcode_atts(
2682          array(
2683              'type'         => 'audio',
2684              'order'        => 'ASC',
2685              'orderby'      => 'menu_order ID',
2686              'id'           => $post ? $post->ID : 0,
2687              'include'      => '',
2688              'exclude'      => '',
2689              'style'        => 'light',
2690              'tracklist'    => true,
2691              'tracknumbers' => true,
2692              'images'       => true,
2693              'artists'      => true,
2694          ),
2695          $attr,
2696          'playlist'
2697      );
2698  
2699      $id = (int) $atts['id'];
2700  
2701      if ( 'audio' !== $atts['type'] ) {
2702          $atts['type'] = 'video';
2703      }
2704  
2705      $args = array(
2706          'post_status'    => 'inherit',
2707          'post_type'      => 'attachment',
2708          'post_mime_type' => $atts['type'],
2709          'order'          => $atts['order'],
2710          'orderby'        => $atts['orderby'],
2711      );
2712  
2713      if ( ! empty( $atts['include'] ) ) {
2714          $args['include'] = $atts['include'];
2715          $_attachments    = get_posts( $args );
2716  
2717          $attachments = array();
2718          foreach ( $_attachments as $key => $val ) {
2719              $attachments[ $val->ID ] = $_attachments[ $key ];
2720          }
2721      } elseif ( ! empty( $atts['exclude'] ) ) {
2722          $args['post_parent'] = $id;
2723          $args['exclude']     = $atts['exclude'];
2724          $attachments         = get_children( $args );
2725      } else {
2726          $args['post_parent'] = $id;
2727          $attachments         = get_children( $args );
2728      }
2729  
2730      if ( empty( $attachments ) ) {
2731          return '';
2732      }
2733  
2734      if ( is_feed() ) {
2735          $output = "\n";
2736          foreach ( $attachments as $att_id => $attachment ) {
2737              $output .= wp_get_attachment_link( $att_id ) . "\n";
2738          }
2739          return $output;
2740      }
2741  
2742      $outer = 22; // Default padding and border of wrapper.
2743  
2744      $default_width  = 640;
2745      $default_height = 360;
2746  
2747      $theme_width  = empty( $content_width ) ? $default_width : ( $content_width - $outer );
2748      $theme_height = empty( $content_width ) ? $default_height : round( ( $default_height * $theme_width ) / $default_width );
2749  
2750      $data = array(
2751          'type'         => $atts['type'],
2752          // Don't pass strings to JSON, will be truthy in JS.
2753          'tracklist'    => wp_validate_boolean( $atts['tracklist'] ),
2754          'tracknumbers' => wp_validate_boolean( $atts['tracknumbers'] ),
2755          'images'       => wp_validate_boolean( $atts['images'] ),
2756          'artists'      => wp_validate_boolean( $atts['artists'] ),
2757      );
2758  
2759      $tracks = array();
2760      foreach ( $attachments as $attachment ) {
2761          $url   = wp_get_attachment_url( $attachment->ID );
2762          $ftype = wp_check_filetype( $url, wp_get_mime_types() );
2763          $track = array(
2764              'src'         => $url,
2765              'type'        => $ftype['type'],
2766              'title'       => $attachment->post_title,
2767              'caption'     => $attachment->post_excerpt,
2768              'description' => $attachment->post_content,
2769          );
2770  
2771          $track['meta'] = array();
2772          $meta          = wp_get_attachment_metadata( $attachment->ID );
2773          if ( ! empty( $meta ) ) {
2774  
2775              foreach ( wp_get_attachment_id3_keys( $attachment ) as $key => $label ) {
2776                  if ( ! empty( $meta[ $key ] ) ) {
2777                      $track['meta'][ $key ] = $meta[ $key ];
2778                  }
2779              }
2780  
2781              if ( 'video' === $atts['type'] ) {
2782                  if ( ! empty( $meta['width'] ) && ! empty( $meta['height'] ) ) {
2783                      $width        = $meta['width'];
2784                      $height       = $meta['height'];
2785                      $theme_height = round( ( $height * $theme_width ) / $width );
2786                  } else {
2787                      $width  = $default_width;
2788                      $height = $default_height;
2789                  }
2790  
2791                  $track['dimensions'] = array(
2792                      'original' => compact( 'width', 'height' ),
2793                      'resized'  => array(
2794                          'width'  => $theme_width,
2795                          'height' => $theme_height,
2796                      ),
2797                  );
2798              }
2799          }
2800  
2801          if ( $atts['images'] ) {
2802              $thumb_id = get_post_thumbnail_id( $attachment->ID );
2803              if ( ! empty( $thumb_id ) ) {
2804                  list( $src, $width, $height ) = wp_get_attachment_image_src( $thumb_id, 'full' );
2805                  $track['image']               = compact( 'src', 'width', 'height' );
2806                  list( $src, $width, $height ) = wp_get_attachment_image_src( $thumb_id, 'thumbnail' );
2807                  $track['thumb']               = compact( 'src', 'width', 'height' );
2808              } else {
2809                  $src            = wp_mime_type_icon( $attachment->ID );
2810                  $width          = 48;
2811                  $height         = 64;
2812                  $track['image'] = compact( 'src', 'width', 'height' );
2813                  $track['thumb'] = compact( 'src', 'width', 'height' );
2814              }
2815          }
2816  
2817          $tracks[] = $track;
2818      }
2819      $data['tracks'] = $tracks;
2820  
2821      $safe_type  = esc_attr( $atts['type'] );
2822      $safe_style = esc_attr( $atts['style'] );
2823  
2824      ob_start();
2825  
2826      if ( 1 === $instance ) {
2827          /**
2828           * Prints and enqueues playlist scripts, styles, and JavaScript templates.
2829           *
2830           * @since 3.9.0
2831           *
2832           * @param string $type  Type of playlist. Possible values are 'audio' or 'video'.
2833           * @param string $style The 'theme' for the playlist. Core provides 'light' and 'dark'.
2834           */
2835          do_action( 'wp_playlist_scripts', $atts['type'], $atts['style'] );
2836      }
2837      ?>
2838  <div class="wp-playlist wp-<?php echo $safe_type; ?>-playlist wp-playlist-<?php echo $safe_style; ?>">
2839      <?php if ( 'audio' === $atts['type'] ) : ?>
2840          <div class="wp-playlist-current-item"></div>
2841      <?php endif; ?>
2842      <<?php echo $safe_type; ?> controls="controls" preload="none" width="<?php echo (int) $theme_width; ?>"
2843          <?php
2844          if ( 'video' === $safe_type ) {
2845              echo ' height="', (int) $theme_height, '"';
2846          }
2847          ?>
2848      ></<?php echo $safe_type; ?>>
2849      <div class="wp-playlist-next"></div>
2850      <div class="wp-playlist-prev"></div>
2851      <noscript>
2852      <ol>
2853          <?php
2854          foreach ( $attachments as $att_id => $attachment ) {
2855              printf( '<li>%s</li>', wp_get_attachment_link( $att_id ) );
2856          }
2857          ?>
2858      </ol>
2859      </noscript>
2860      <script type="application/json" class="wp-playlist-script"><?php echo wp_json_encode( $data ); ?></script>
2861  </div>
2862      <?php
2863      return ob_get_clean();
2864  }
2865  add_shortcode( 'playlist', 'wp_playlist_shortcode' );
2866  
2867  /**
2868   * Provides a No-JS Flash fallback as a last resort for audio / video.
2869   *
2870   * @since 3.6.0
2871   *
2872   * @param string $url The media element URL.
2873   * @return string Fallback HTML.
2874   */
2875  function wp_mediaelement_fallback( $url ) {
2876      /**
2877       * Filters the Mediaelement fallback output for no-JS.
2878       *
2879       * @since 3.6.0
2880       *
2881       * @param string $output Fallback output for no-JS.
2882       * @param string $url    Media file URL.
2883       */
2884      return apply_filters( 'wp_mediaelement_fallback', sprintf( '<a href="%1$s">%1$s</a>', esc_url( $url ) ), $url );
2885  }
2886  
2887  /**
2888   * Returns a filtered list of supported audio formats.
2889   *
2890   * @since 3.6.0
2891   *
2892   * @return string[] Supported audio formats.
2893   */
2894  function wp_get_audio_extensions() {
2895      /**
2896       * Filters the list of supported audio formats.
2897       *
2898       * @since 3.6.0
2899       *
2900       * @param string[] $extensions An array of supported audio formats. Defaults are
2901       *                            'mp3', 'ogg', 'flac', 'm4a', 'wav'.
2902       */
2903      return apply_filters( 'wp_audio_extensions', array( 'mp3', 'ogg', 'flac', 'm4a', 'wav' ) );
2904  }
2905  
2906  /**
2907   * Returns useful keys to use to lookup data from an attachment's stored metadata.
2908   *
2909   * @since 3.9.0
2910   *
2911   * @param WP_Post $attachment The current attachment, provided for context.
2912   * @param string  $context    Optional. The context. Accepts 'edit', 'display'. Default 'display'.
2913   * @return string[] Key/value pairs of field keys to labels.
2914   */
2915  function wp_get_attachment_id3_keys( $attachment, $context = 'display' ) {
2916      $fields = array(
2917          'artist' => __( 'Artist' ),
2918          'album'  => __( 'Album' ),
2919      );
2920  
2921      if ( 'display' === $context ) {
2922          $fields['genre']            = __( 'Genre' );
2923          $fields['year']             = __( 'Year' );
2924          $fields['length_formatted'] = _x( 'Length', 'video or audio' );
2925      } elseif ( 'js' === $context ) {
2926          $fields['bitrate']      = __( 'Bitrate' );
2927          $fields['bitrate_mode'] = __( 'Bitrate Mode' );
2928      }
2929  
2930      /**
2931       * Filters the editable list of keys to look up data from an attachment's metadata.
2932       *
2933       * @since 3.9.0
2934       *
2935       * @param array   $fields     Key/value pairs of field keys to labels.
2936       * @param WP_Post $attachment Attachment object.
2937       * @param string  $context    The context. Accepts 'edit', 'display'. Default 'display'.
2938       */
2939      return apply_filters( 'wp_get_attachment_id3_keys', $fields, $attachment, $context );
2940  }
2941  /**
2942   * Builds the Audio shortcode output.
2943   *
2944   * This implements the functionality of the Audio Shortcode for displaying
2945   * WordPress mp3s in a post.
2946   *
2947   * @since 3.6.0
2948   *
2949   * @param array  $attr {
2950   *     Attributes of the audio shortcode.
2951   *
2952   *     @type string $src      URL to the source of the audio file. Default empty.
2953   *     @type string $loop     The 'loop' attribute for the `<audio>` element. Default empty.
2954   *     @type string $autoplay The 'autoplay' attribute for the `<audio>` element. Default empty.
2955   *     @type string $preload  The 'preload' attribute for the `<audio>` element. Default 'none'.
2956   *     @type string $class    The 'class' attribute for the `<audio>` element. Default 'wp-audio-shortcode'.
2957   *     @type string $style    The 'style' attribute for the `<audio>` element. Default 'width: 100%;'.
2958   * }
2959   * @param string $content Shortcode content.
2960   * @return string|void HTML content to display audio.
2961   */
2962  function wp_audio_shortcode( $attr, $content = '' ) {
2963      $post_id = get_post() ? get_the_ID() : 0;
2964  
2965      static $instance = 0;
2966      $instance++;
2967  
2968      /**
2969       * Filters the default audio shortcode output.
2970       *
2971       * If the filtered output isn't empty, it will be used instead of generating the default audio template.
2972       *
2973       * @since 3.6.0
2974       *
2975       * @param string $html     Empty variable to be replaced with shortcode markup.
2976       * @param array  $attr     Attributes of the shortcode. @see wp_audio_shortcode()
2977       * @param string $content  Shortcode content.
2978       * @param int    $instance Unique numeric ID of this audio shortcode instance.
2979       */
2980      $override = apply_filters( 'wp_audio_shortcode_override', '', $attr, $content, $instance );
2981  
2982      if ( '' !== $override ) {
2983          return $override;
2984      }
2985  
2986      $audio = null;
2987  
2988      $default_types = wp_get_audio_extensions();
2989      $defaults_atts = array(
2990          'src'      => '',
2991          'loop'     => '',
2992          'autoplay' => '',
2993          'preload'  => 'none',
2994          'class'    => 'wp-audio-shortcode',
2995          'style'    => 'width: 100%;',
2996      );
2997      foreach ( $default_types as $type ) {
2998          $defaults_atts[ $type ] = '';
2999      }
3000  
3001      $atts = shortcode_atts( $defaults_atts, $attr, 'audio' );
3002  
3003      $primary = false;
3004      if ( ! empty( $atts['src'] ) ) {
3005          $type = wp_check_filetype( $atts['src'], wp_get_mime_types() );
3006  
3007          if ( ! in_array( strtolower( $type['ext'] ), $default_types, true ) ) {
3008              return sprintf( '<a class="wp-embedded-audio" href="%s">%s</a>', esc_url( $atts['src'] ), esc_html( $atts['src'] ) );
3009          }
3010  
3011          $primary = true;
3012          array_unshift( $default_types, 'src' );
3013      } else {
3014          foreach ( $default_types as $ext ) {
3015              if ( ! empty( $atts[ $ext ] ) ) {
3016                  $type = wp_check_filetype( $atts[ $ext ], wp_get_mime_types() );
3017  
3018                  if ( strtolower( $type['ext'] ) === $ext ) {
3019                      $primary = true;
3020                  }
3021              }
3022          }
3023      }
3024  
3025      if ( ! $primary ) {
3026          $audios = get_attached_media( 'audio', $post_id );
3027  
3028          if ( empty( $audios ) ) {
3029              return;
3030          }
3031  
3032          $audio       = reset( $audios );
3033          $atts['src'] = wp_get_attachment_url( $audio->ID );
3034  
3035          if ( empty( $atts['src'] ) ) {
3036              return;
3037          }
3038  
3039          array_unshift( $default_types, 'src' );
3040      }
3041  
3042      /**
3043       * Filters the media library used for the audio shortcode.
3044       *
3045       * @since 3.6.0
3046       *
3047       * @param string $library Media library used for the audio shortcode.
3048       */
3049      $library = apply_filters( 'wp_audio_shortcode_library', 'mediaelement' );
3050  
3051      if ( 'mediaelement' === $library && did_action( 'init' ) ) {
3052          wp_enqueue_style( 'wp-mediaelement' );
3053          wp_enqueue_script( 'wp-mediaelement' );
3054      }
3055  
3056      /**
3057       * Filters the class attribute for the audio shortcode output container.
3058       *
3059       * @since 3.6.0
3060       * @since 4.9.0 The `$atts` parameter was added.
3061       *
3062       * @param string $class CSS class or list of space-separated classes.
3063       * @param array  $atts  Array of audio shortcode attributes.
3064       */
3065      $atts['class'] = apply_filters( 'wp_audio_shortcode_class', $atts['class'], $atts );
3066  
3067      $html_atts = array(
3068          'class'    => $atts['class'],
3069          'id'       => sprintf( 'audio-%d-%d', $post_id, $instance ),
3070          'loop'     => wp_validate_boolean( $atts['loop'] ),
3071          'autoplay' => wp_validate_boolean( $atts['autoplay'] ),
3072          'preload'  => $atts['preload'],
3073          'style'    => $atts['style'],
3074      );
3075  
3076      // These ones should just be omitted altogether if they are blank.
3077      foreach ( array( 'loop', 'autoplay', 'preload' ) as $a ) {
3078          if ( empty( $html_atts[ $a ] ) ) {
3079              unset( $html_atts[ $a ] );
3080          }
3081      }
3082  
3083      $attr_strings = array();
3084  
3085      foreach ( $html_atts as $k => $v ) {
3086          $attr_strings[] = $k . '="' . esc_attr( $v ) . '"';
3087      }
3088  
3089      $html = '';
3090  
3091      if ( 'mediaelement' === $library && 1 === $instance ) {
3092          $html .= "<!--[if lt IE 9]><script>document.createElement('audio');</script><![endif]-->\n";
3093      }
3094  
3095      $html .= sprintf( '<audio %s controls="controls">', implode( ' ', $attr_strings ) );
3096  
3097      $fileurl = '';
3098      $source  = '<source type="%s" src="%s" />';
3099  
3100      foreach ( $default_types as $fallback ) {
3101          if ( ! empty( $atts[ $fallback ] ) ) {
3102              if ( empty( $fileurl ) ) {
3103                  $fileurl = $atts[ $fallback ];
3104              }
3105  
3106              $type  = wp_check_filetype( $atts[ $fallback ], wp_get_mime_types() );
3107              $url   = add_query_arg( '_', $instance, $atts[ $fallback ] );
3108              $html .= sprintf( $source, $type['type'], esc_url( $url ) );
3109          }
3110      }
3111  
3112      if ( 'mediaelement' === $library ) {
3113          $html .= wp_mediaelement_fallback( $fileurl );
3114      }
3115  
3116      $html .= '</audio>';
3117  
3118      /**
3119       * Filters the audio shortcode output.
3120       *
3121       * @since 3.6.0
3122       *
3123       * @param string $html    Audio shortcode HTML output.
3124       * @param array  $atts    Array of audio shortcode attributes.
3125       * @param string $audio   Audio file.
3126       * @param int    $post_id Post ID.
3127       * @param string $library Media library used for the audio shortcode.
3128       */
3129      return apply_filters( 'wp_audio_shortcode', $html, $atts, $audio, $post_id, $library );
3130  }
3131  add_shortcode( 'audio', 'wp_audio_shortcode' );
3132  
3133  /**
3134   * Returns a filtered list of supported video formats.
3135   *
3136   * @since 3.6.0
3137   *
3138   * @return string[] List of supported video formats.
3139   */
3140  function wp_get_video_extensions() {
3141      /**
3142       * Filters the list of supported video formats.
3143       *
3144       * @since 3.6.0
3145       *
3146       * @param string[] $extensions An array of supported video formats. Defaults are
3147       *                             'mp4', 'm4v', 'webm', 'ogv', 'flv'.
3148       */
3149      return apply_filters( 'wp_video_extensions', array( 'mp4', 'm4v', 'webm', 'ogv', 'flv' ) );
3150  }
3151  
3152  /**
3153   * Builds the Video shortcode output.
3154   *
3155   * This implements the functionality of the Video Shortcode for displaying
3156   * WordPress mp4s in a post.
3157   *
3158   * @since 3.6.0
3159   *
3160   * @global int $content_width
3161   *
3162   * @param array  $attr {
3163   *     Attributes of the shortcode.
3164   *
3165   *     @type string $src      URL to the source of the video file. Default empty.
3166   *     @type int    $height   Height of the video embed in pixels. Default 360.
3167   *     @type int    $width    Width of the video embed in pixels. Default $content_width or 640.
3168   *     @type string $poster   The 'poster' attribute for the `<video>` element. Default empty.
3169   *     @type string $loop     The 'loop' attribute for the `<video>` element. Default empty.
3170   *     @type string $autoplay The 'autoplay' attribute for the `<video>` element. Default empty.
3171   *     @type string $preload  The 'preload' attribute for the `<video>` element.
3172   *                            Default 'metadata'.
3173   *     @type string $class    The 'class' attribute for the `<video>` element.
3174   *                            Default 'wp-video-shortcode'.
3175   * }
3176   * @param string $content Shortcode content.
3177   * @return string|void HTML content to display video.
3178   */
3179  function wp_video_shortcode( $attr, $content = '' ) {
3180      global $content_width;
3181      $post_id = get_post() ? get_the_ID() : 0;
3182  
3183      static $instance = 0;
3184      $instance++;
3185  
3186      /**
3187       * Filters the default video shortcode output.
3188       *
3189       * If the filtered output isn't empty, it will be used instead of generating
3190       * the default video template.
3191       *
3192       * @since 3.6.0
3193       *
3194       * @see wp_video_shortcode()
3195       *
3196       * @param string $html     Empty variable to be replaced with shortcode markup.
3197       * @param array  $attr     Attributes of the shortcode. @see wp_video_shortcode()
3198       * @param string $content  Video shortcode content.
3199       * @param int    $instance Unique numeric ID of this video shortcode instance.
3200       */
3201      $override = apply_filters( 'wp_video_shortcode_override', '', $attr, $content, $instance );
3202  
3203      if ( '' !== $override ) {
3204          return $override;
3205      }
3206  
3207      $video = null;
3208  
3209      $default_types = wp_get_video_extensions();
3210      $defaults_atts = array(
3211          'src'      => '',
3212          'poster'   => '',
3213          'loop'     => '',
3214          'autoplay' => '',
3215          'preload'  => 'metadata',
3216          'width'    => 640,
3217          'height'   => 360,
3218          'class'    => 'wp-video-shortcode',
3219      );
3220  
3221      foreach ( $default_types as $type ) {
3222          $defaults_atts[ $type ] = '';
3223      }
3224  
3225      $atts = shortcode_atts( $defaults_atts, $attr, 'video' );
3226  
3227      if ( is_admin() ) {
3228          // Shrink the video so it isn't huge in the admin.
3229          if ( $atts['width'] > $defaults_atts['width'] ) {
3230              $atts['height'] = round( ( $atts['height'] * $defaults_atts['width'] ) / $atts['width'] );
3231              $atts['width']  = $defaults_atts['width'];
3232          }
3233      } else {
3234          // If the video is bigger than the theme.
3235          if ( ! empty( $content_width ) && $atts['width'] > $content_width ) {
3236              $atts['height'] = round( ( $atts['height'] * $content_width ) / $atts['width'] );
3237              $atts['width']  = $content_width;
3238          }
3239      }
3240  
3241      $is_vimeo      = false;
3242      $is_youtube    = false;
3243      $yt_pattern    = '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#';
3244      $vimeo_pattern = '#^https?://(.+\.)?vimeo\.com/.*#';
3245  
3246      $primary = false;
3247      if ( ! empty( $atts['src'] ) ) {
3248          $is_vimeo   = ( preg_match( $vimeo_pattern, $atts['src'] ) );
3249          $is_youtube = ( preg_match( $yt_pattern, $atts['src'] ) );
3250  
3251          if ( ! $is_youtube && ! $is_vimeo ) {
3252              $type = wp_check_filetype( $atts['src'], wp_get_mime_types() );
3253  
3254              if ( ! in_array( strtolower( $type['ext'] ), $default_types, true ) ) {
3255                  return sprintf( '<a class="wp-embedded-video" href="%s">%s</a>', esc_url( $atts['src'] ), esc_html( $atts['src'] ) );
3256              }
3257          }
3258  
3259          if ( $is_vimeo ) {
3260              wp_enqueue_script( 'mediaelement-vimeo' );
3261          }
3262  
3263          $primary = true;
3264          array_unshift( $default_types, 'src' );
3265      } else {
3266          foreach ( $default_types as $ext ) {
3267              if ( ! empty( $atts[ $ext ] ) ) {
3268                  $type = wp_check_filetype( $atts[ $ext ], wp_get_mime_types() );
3269                  if ( strtolower( $type['ext'] ) === $ext ) {
3270                      $primary = true;
3271                  }
3272              }
3273          }
3274      }
3275  
3276      if ( ! $primary ) {
3277          $videos = get_attached_media( 'video', $post_id );
3278          if ( empty( $videos ) ) {
3279              return;
3280          }
3281  
3282          $video       = reset( $videos );
3283          $atts['src'] = wp_get_attachment_url( $video->ID );
3284          if ( empty( $atts['src'] ) ) {
3285              return;
3286          }
3287  
3288          array_unshift( $default_types, 'src' );
3289      }
3290  
3291      /**
3292       * Filters the media library used for the video shortcode.
3293       *
3294       * @since 3.6.0
3295       *
3296       * @param string $library Media library used for the video shortcode.
3297       */
3298      $library = apply_filters( 'wp_video_shortcode_library', 'mediaelement' );
3299      if ( 'mediaelement' === $library && did_action( 'init' ) ) {
3300          wp_enqueue_style( 'wp-mediaelement' );
3301          wp_enqueue_script( 'wp-mediaelement' );
3302          wp_enqueue_script( 'mediaelement-vimeo' );
3303      }
3304  
3305      // MediaElement.js has issues with some URL formats for Vimeo and YouTube,
3306      // so update the URL to prevent the ME.js player from breaking.
3307      if ( 'mediaelement' === $library ) {
3308          if ( $is_youtube ) {
3309              // Remove `feature` query arg and force SSL - see #40866.
3310              $atts['src'] = remove_query_arg( 'feature', $atts['src'] );
3311              $atts['src'] = set_url_scheme( $atts['src'], 'https' );
3312          } elseif ( $is_vimeo ) {
3313              // Remove all query arguments and force SSL - see #40866.
3314              $parsed_vimeo_url = wp_parse_url( $atts['src'] );
3315              $vimeo_src        = 'https://' . $parsed_vimeo_url['host'] . $parsed_vimeo_url['path'];
3316  
3317              // Add loop param for mejs bug - see #40977, not needed after #39686.
3318              $loop        = $atts['loop'] ? '1' : '0';
3319              $atts['src'] = add_query_arg( 'loop', $loop, $vimeo_src );
3320          }
3321      }
3322  
3323      /**
3324       * Filters the class attribute for the video shortcode output container.
3325       *
3326       * @since 3.6.0
3327       * @since 4.9.0 The `$atts` parameter was added.
3328       *
3329       * @param string $class CSS class or list of space-separated classes.
3330       * @param array  $atts  Array of video shortcode attributes.
3331       */
3332      $atts['class'] = apply_filters( 'wp_video_shortcode_class', $atts['class'], $atts );
3333  
3334      $html_atts = array(
3335          'class'    => $atts['class'],
3336          'id'       => sprintf( 'video-%d-%d', $post_id, $instance ),
3337          'width'    => absint( $atts['width'] ),
3338          'height'   => absint( $atts['height'] ),
3339          'poster'   => esc_url( $atts['poster'] ),
3340          'loop'     => wp_validate_boolean( $atts['loop'] ),
3341          'autoplay' => wp_validate_boolean( $atts['autoplay'] ),
3342          'preload'  => $atts['preload'],
3343      );
3344  
3345      // These ones should just be omitted altogether if they are blank.
3346      foreach ( array( 'poster', 'loop', 'autoplay', 'preload' ) as $a ) {
3347          if ( empty( $html_atts[ $a ] ) ) {
3348              unset( $html_atts[ $a ] );
3349          }
3350      }
3351  
3352      $attr_strings = array();
3353      foreach ( $html_atts as $k => $v ) {
3354          $attr_strings[] = $k . '="' . esc_attr( $v ) . '"';
3355      }
3356  
3357      $html = '';
3358  
3359      if ( 'mediaelement' === $library && 1 === $instance ) {
3360          $html .= "<!--[if lt IE 9]><script>document.createElement('video');</script><![endif]-->\n";
3361      }
3362  
3363      $html .= sprintf( '<video %s controls="controls">', implode( ' ', $attr_strings ) );
3364  
3365      $fileurl = '';
3366      $source  = '<source type="%s" src="%s" />';
3367  
3368      foreach ( $default_types as $fallback ) {
3369          if ( ! empty( $atts[ $fallback ] ) ) {
3370              if ( empty( $fileurl ) ) {
3371                  $fileurl = $atts[ $fallback ];
3372              }
3373              if ( 'src' === $fallback && $is_youtube ) {
3374                  $type = array( 'type' => 'video/youtube' );
3375              } elseif ( 'src' === $fallback && $is_vimeo ) {
3376                  $type = array( 'type' => 'video/vimeo' );
3377              } else {
3378                  $type = wp_check_filetype( $atts[ $fallback ], wp_get_mime_types() );
3379              }
3380              $url   = add_query_arg( '_', $instance, $atts[ $fallback ] );
3381              $html .= sprintf( $source, $type['type'], esc_url( $url ) );
3382          }
3383      }
3384  
3385      if ( ! empty( $content ) ) {
3386          if ( false !== strpos( $content, "\n" ) ) {
3387              $content = str_replace( array( "\r\n", "\n", "\t" ), '', $content );
3388          }
3389          $html .= trim( $content );
3390      }
3391  
3392      if ( 'mediaelement' === $library ) {
3393          $html .= wp_mediaelement_fallback( $fileurl );
3394      }
3395      $html .= '</video>';
3396  
3397      $width_rule = '';
3398      if ( ! empty( $atts['width'] ) ) {
3399          $width_rule = sprintf( 'width: %dpx;', $atts['width'] );
3400      }
3401      $output = sprintf( '<div style="%s" class="wp-video">%s</div>', $width_rule, $html );
3402  
3403      /**
3404       * Filters the output of the video shortcode.
3405       *
3406       * @since 3.6.0
3407       *
3408       * @param string $output  Video shortcode HTML output.
3409       * @param array  $atts    Array of video shortcode attributes.
3410       * @param string $video   Video file.
3411       * @param int    $post_id Post ID.
3412       * @param string $library Media library used for the video shortcode.
3413       */
3414      return apply_filters( 'wp_video_shortcode', $output, $atts, $video, $post_id, $library );
3415  }
3416  add_shortcode( 'video', 'wp_video_shortcode' );
3417  
3418  /**
3419   * Gets the previous image link that has the same post parent.
3420   *
3421   * @since 5.8.0
3422   *
3423   * @see get_adjacent_image_link()
3424   *
3425   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
3426   *                           of width and height values in pixels (in that order). Default 'thumbnail'.
3427   * @param string|false $text Optional. Link text. Default false.
3428   * @return string Markup for previous image link.
3429   */
3430  function get_previous_image_link( $size = 'thumbnail', $text = false ) {
3431      return get_adjacent_image_link( true, $size, $text );
3432  }
3433  
3434  /**
3435   * Displays previous image link that has the same post parent.
3436   *
3437   * @since 2.5.0
3438   *
3439   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
3440   *                           of width and height values in pixels (in that order). Default 'thumbnail'.
3441   * @param string|false $text Optional. Link text. Default false.
3442   */
3443  function previous_image_link( $size = 'thumbnail', $text = false ) {
3444      echo get_previous_image_link( $size, $text );
3445  }
3446  
3447  /**
3448   * Gets the next image link that has the same post parent.
3449   *
3450   * @since 5.8.0
3451   *
3452   * @see get_adjacent_image_link()
3453   *
3454   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
3455   *                           of width and height values in pixels (in that order). Default 'thumbnail'.
3456   * @param string|false $text Optional. Link text. Default false.
3457   * @return string Markup for next image link.
3458   */
3459  function get_next_image_link( $size = 'thumbnail', $text = false ) {
3460      return get_adjacent_image_link( false, $size, $text );
3461  }
3462  
3463  /**
3464   * Displays next image link that has the same post parent.
3465   *
3466   * @since 2.5.0
3467   *
3468   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
3469   *                           of width and height values in pixels (in that order). Default 'thumbnail'.
3470   * @param string|false $text Optional. Link text. Default false.
3471   */
3472  function next_image_link( $size = 'thumbnail', $text = false ) {
3473      echo get_next_image_link( $size, $text );
3474  }
3475  
3476  /**
3477   * Gets the next or previous image link that has the same post parent.
3478   *
3479   * Retrieves the current attachment object from the $post global.
3480   *
3481   * @since 5.8.0
3482   *
3483   * @param bool         $prev Optional. Whether to display the next (false) or previous (true) link. Default true.
3484   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
3485   *                           of width and height values in pixels (in that order). Default 'thumbnail'.
3486   * @param bool         $text Optional. Link text. Default false.
3487   * @return string Markup for image link.
3488   */
3489  function get_adjacent_image_link( $prev = true, $size = 'thumbnail', $text = false ) {
3490      $post        = get_post();
3491      $attachments = array_values(
3492          get_children(
3493              array(
3494                  'post_parent'    => $post->post_parent,
3495                  'post_status'    => 'inherit',
3496                  'post_type'      => 'attachment',
3497                  'post_mime_type' => 'image',
3498                  'order'          => 'ASC',
3499                  'orderby'        => 'menu_order ID',
3500              )
3501          )
3502      );
3503  
3504      foreach ( $attachments as $k => $attachment ) {
3505          if ( (int) $attachment->ID === (int) $post->ID ) {
3506              break;
3507          }
3508      }
3509  
3510      $output        = '';
3511      $attachment_id = 0;
3512  
3513      if ( $attachments ) {
3514          $k = $prev ? $k - 1 : $k + 1;
3515  
3516          if ( isset( $attachments[ $k ] ) ) {
3517              $attachment_id = $attachments[ $k ]->ID;
3518              $attr          = array( 'alt' => get_the_title( $attachment_id ) );
3519              $output        = wp_get_attachment_link( $attachment_id, $size, true, false, $text, $attr );
3520          }
3521      }
3522  
3523      $adjacent = $prev ? 'previous' : 'next';
3524  
3525      /**
3526       * Filters the adjacent image link.
3527       *
3528       * The dynamic portion of the hook name, `$adjacent`, refers to the type of adjacency,
3529       * either 'next', or 'previous'.
3530       *
3531       * Possible hook names include:
3532       *
3533       *  - `next_image_link`
3534       *  - `previous_image_link`
3535       *
3536       * @since 3.5.0
3537       *
3538       * @param string $output        Adjacent image HTML markup.
3539       * @param int    $attachment_id Attachment ID
3540       * @param string|int[] $size    Requested image size. Can be any registered image size name, or
3541       *                              an array of width and height values in pixels (in that order).
3542       * @param string $text          Link text.
3543       */
3544      return apply_filters( "{$adjacent}_image_link", $output, $attachment_id, $size, $text );
3545  }
3546  
3547  /**
3548   * Displays next or previous image link that has the same post parent.
3549   *
3550   * Retrieves the current attachment object from the $post global.
3551   *
3552   * @since 2.5.0
3553   *
3554   * @param bool         $prev Optional. Whether to display the next (false) or previous (true) link. Default true.
3555   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
3556   *                           of width and height values in pixels (in that order). Default 'thumbnail'.
3557   * @param bool         $text Optional. Link text. Default false.
3558   */
3559  function adjacent_image_link( $prev = true, $size = 'thumbnail', $text = false ) {
3560      echo get_adjacent_image_link( $prev, $size, $text );
3561  }
3562  
3563  /**
3564   * Retrieves taxonomies attached to given the attachment.
3565   *
3566   * @since 2.5.0
3567   * @since 4.7.0 Introduced the `$output` parameter.
3568   *
3569   * @param int|array|object $attachment Attachment ID, data array, or data object.
3570   * @param string           $output     Output type. 'names' to return an array of taxonomy names,
3571   *                                     or 'objects' to return an array of taxonomy objects.
3572   *                                     Default is 'names'.
3573   * @return string[]|WP_Taxonomy[] List of taxonomies or taxonomy names. Empty array on failure.
3574   */
3575  function get_attachment_taxonomies( $attachment, $output = 'names' ) {
3576      if ( is_int( $attachment ) ) {
3577          $attachment = get_post( $attachment );
3578      } elseif ( is_array( $attachment ) ) {
3579          $attachment = (object) $attachment;
3580      }
3581  
3582      if ( ! is_object( $attachment ) ) {
3583          return array();
3584      }
3585  
3586      $file     = get_attached_file( $attachment->ID );
3587      $filename = wp_basename( $file );
3588  
3589      $objects = array( 'attachment' );
3590  
3591      if ( false !== strpos( $filename, '.' ) ) {
3592          $objects[] = 'attachment:' . substr( $filename, strrpos( $filename, '.' ) + 1 );
3593      }
3594  
3595      if ( ! empty( $attachment->post_mime_type ) ) {
3596          $objects[] = 'attachment:' . $attachment->post_mime_type;
3597  
3598          if ( false !== strpos( $attachment->post_mime_type, '/' ) ) {
3599              foreach ( explode( '/', $attachment->post_mime_type ) as $token ) {
3600                  if ( ! empty( $token ) ) {
3601                      $objects[] = "attachment:$token";
3602                  }
3603              }
3604          }
3605      }
3606  
3607      $taxonomies = array();
3608  
3609      foreach ( $objects as $object ) {
3610          $taxes = get_object_taxonomies( $object, $output );
3611  
3612          if ( $taxes ) {
3613              $taxonomies = array_merge( $taxonomies, $taxes );
3614          }
3615      }
3616  
3617      if ( 'names' === $output ) {
3618          $taxonomies = array_unique( $taxonomies );
3619      }
3620  
3621      return $taxonomies;
3622  }
3623  
3624  /**
3625   * Retrieves all of the taxonomies that are registered for attachments.
3626   *
3627   * Handles mime-type-specific taxonomies such as attachment:image and attachment:video.
3628   *
3629   * @since 3.5.0
3630   *
3631   * @see get_taxonomies()
3632   *
3633   * @param string $output Optional. The type of taxonomy output to return. Accepts 'names' or 'objects'.
3634   *                       Default 'names'.
3635   * @return string[]|WP_Taxonomy[] Array of names or objects of registered taxonomies for attachments.
3636   */
3637  function get_taxonomies_for_attachments( $output = 'names' ) {
3638      $taxonomies = array();
3639  
3640      foreach ( get_taxonomies( array(), 'objects' ) as $taxonomy ) {
3641          foreach ( $taxonomy->object_type as $object_type ) {
3642              if ( 'attachment' === $object_type || 0 === strpos( $object_type, 'attachment:' ) ) {
3643                  if ( 'names' === $output ) {
3644                      $taxonomies[] = $taxonomy->name;
3645                  } else {
3646                      $taxonomies[ $taxonomy->name ] = $taxonomy;
3647                  }
3648                  break;
3649              }
3650          }
3651      }
3652  
3653      return $taxonomies;
3654  }
3655  
3656  /**
3657   * Determines whether the value is an acceptable type for GD image functions.
3658   *
3659   * In PHP 8.0, the GD extension uses GdImage objects for its data structures.
3660   * This function checks if the passed value is either a resource of type `gd`
3661   * or a GdImage object instance. Any other type will return false.
3662   *
3663   * @since 5.6.0
3664   *
3665   * @param resource|GdImage|false $image A value to check the type for.
3666   * @return bool True if $image is either a GD image resource or GdImage instance,
3667   *              false otherwise.
3668   */
3669  function is_gd_image( $image ) {
3670      if ( is_resource( $image ) && 'gd' === get_resource_type( $image )
3671          || is_object( $image ) && $image instanceof GdImage
3672      ) {
3673          return true;
3674      }
3675  
3676      return false;
3677  }
3678  
3679  /**
3680   * Create new GD image resource with transparency support
3681   *
3682   * @todo Deprecate if possible.
3683   *
3684   * @since 2.9.0
3685   *
3686   * @param int $width  Image width in pixels.
3687   * @param int $height Image height in pixels.
3688   * @return resource|GdImage|false The GD image resource or GdImage instance on success.
3689   *                                False on failure.
3690   */
3691  function wp_imagecreatetruecolor( $width, $height ) {
3692      $img = imagecreatetruecolor( $width, $height );
3693  
3694      if ( is_gd_image( $img )
3695          && function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' )
3696      ) {
3697          imagealphablending( $img, false );
3698          imagesavealpha( $img, true );
3699      }
3700  
3701      return $img;
3702  }
3703  
3704  /**
3705   * Based on a supplied width/height example, return the biggest possible dimensions based on the max width/height.
3706   *
3707   * @since 2.9.0
3708   *
3709   * @see wp_constrain_dimensions()
3710   *
3711   * @param int $example_width  The width of an example embed.
3712   * @param int $example_height The height of an example embed.
3713   * @param int $max_width      The maximum allowed width.
3714   * @param int $max_height     The maximum allowed height.
3715   * @return int[] {
3716   *     An array of maximum width and height values.
3717   *
3718   *     @type int $0 The maximum width in pixels.
3719   *     @type int $1 The maximum height in pixels.
3720   * }
3721   */
3722  function wp_expand_dimensions( $example_width, $example_height, $max_width, $max_height ) {
3723      $example_width  = (int) $example_width;
3724      $example_height = (int) $example_height;
3725      $max_width      = (int) $max_width;
3726      $max_height     = (int) $max_height;
3727  
3728      return wp_constrain_dimensions( $example_width * 1000000, $example_height * 1000000, $max_width, $max_height );
3729  }
3730  
3731  /**
3732   * Determines the maximum upload size allowed in php.ini.
3733   *
3734   * @since 2.5.0
3735   *
3736   * @return int Allowed upload size.
3737   */
3738  function wp_max_upload_size() {
3739      $u_bytes = wp_convert_hr_to_bytes( ini_get( 'upload_max_filesize' ) );
3740      $p_bytes = wp_convert_hr_to_bytes( ini_get( 'post_max_size' ) );
3741  
3742      /**
3743       * Filters the maximum upload size allowed in php.ini.
3744       *
3745       * @since 2.5.0
3746       *
3747       * @param int $size    Max upload size limit in bytes.
3748       * @param int $u_bytes Maximum upload filesize in bytes.
3749       * @param int $p_bytes Maximum size of POST data in bytes.
3750       */
3751      return apply_filters( 'upload_size_limit', min( $u_bytes, $p_bytes ), $u_bytes, $p_bytes );
3752  }
3753  
3754  /**
3755   * Returns a WP_Image_Editor instance and loads file into it.
3756   *
3757   * @since 3.5.0
3758   *
3759   * @param string $path Path to the file to load.
3760   * @param array  $args Optional. Additional arguments for retrieving the image editor.
3761   *                     Default empty array.
3762   * @return WP_Image_Editor|WP_Error The WP_Image_Editor object on success,
3763   *                                  a WP_Error object otherwise.
3764   */
3765  function wp_get_image_editor( $path, $args = array() ) {
3766      $args['path'] = $path;
3767  
3768      if ( ! isset( $args['mime_type'] ) ) {
3769          $file_info = wp_check_filetype( $args['path'] );
3770  
3771          // If $file_info['type'] is false, then we let the editor attempt to
3772          // figure out the file type, rather than forcing a failure based on extension.
3773          if ( isset( $file_info ) && $file_info['type'] ) {
3774              $args['mime_type'] = $file_info['type'];
3775          }
3776      }
3777  
3778      $implementation = _wp_image_editor_choose( $args );
3779  
3780      if ( $implementation ) {
3781          $editor = new $implementation( $path );
3782          $loaded = $editor->load();
3783  
3784          if ( is_wp_error( $loaded ) ) {
3785              return $loaded;
3786          }
3787  
3788          return $editor;
3789      }
3790  
3791      return new WP_Error( 'image_no_editor', __( 'No editor could be selected.' ) );
3792  }
3793  
3794  /**
3795   * Tests whether there is an editor that supports a given mime type or methods.
3796   *
3797   * @since 3.5.0
3798   *
3799   * @param string|array $args Optional. Array of arguments to retrieve the image editor supports.
3800   *                           Default empty array.
3801   * @return bool True if an eligible editor is found; false otherwise.
3802   */
3803  function wp_image_editor_supports( $args = array() ) {
3804      return (bool) _wp_image_editor_choose( $args );
3805  }
3806  
3807  /**
3808   * Tests which editors are capable of supporting the request.
3809   *
3810   * @ignore
3811   * @since 3.5.0
3812   *
3813   * @param array $args Optional. Array of arguments for choosing a capable editor. Default empty array.
3814   * @return string|false Class name for the first editor that claims to support the request.
3815   *                      False if no editor claims to support the request.
3816   */
3817  function _wp_image_editor_choose( $args = array() ) {
3818      require_once  ABSPATH . WPINC . '/class-wp-image-editor.php';
3819      require_once  ABSPATH . WPINC . '/class-wp-image-editor-gd.php';
3820      require_once  ABSPATH . WPINC . '/class-wp-image-editor-imagick.php';
3821      /**
3822       * Filters the list of image editing library classes.
3823       *
3824       * @since 3.5.0
3825       *
3826       * @param string[] $image_editors Array of available image editor class names. Defaults are
3827       *                                'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD'.
3828       */
3829      $implementations = apply_filters( 'wp_image_editors', array( 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD' ) );
3830  
3831      foreach ( $implementations as $implementation ) {
3832          if ( ! call_user_func( array( $implementation, 'test' ), $args ) ) {
3833              continue;
3834          }
3835  
3836          if ( isset( $args['mime_type'] ) &&
3837              ! call_user_func(
3838                  array( $implementation, 'supports_mime_type' ),
3839                  $args['mime_type']
3840              ) ) {
3841              continue;
3842          }
3843  
3844          if ( isset( $args['methods'] ) &&
3845              array_diff( $args['methods'], get_class_methods( $implementation ) ) ) {
3846  
3847              continue;
3848          }
3849  
3850          return $implementation;
3851      }
3852  
3853      return false;
3854  }
3855  
3856  /**
3857   * Prints default Plupload arguments.
3858   *
3859   * @since 3.4.0
3860   */
3861  function wp_plupload_default_settings() {
3862      $wp_scripts = wp_scripts();
3863  
3864      $data = $wp_scripts->get_data( 'wp-plupload', 'data' );
3865      if ( $data && false !== strpos( $data, '_wpPluploadSettings' ) ) {
3866          return;
3867      }
3868  
3869      $max_upload_size    = wp_max_upload_size();
3870      $allowed_extensions = array_keys( get_allowed_mime_types() );
3871      $extensions         = array();
3872      foreach ( $allowed_extensions as $extension ) {
3873          $extensions = array_merge( $extensions, explode( '|', $extension ) );
3874      }
3875  
3876      /*
3877       * Since 4.9 the `runtimes` setting is hardcoded in our version of Plupload to `html5,html4`,
3878       * and the `flash_swf_url` and `silverlight_xap_url` are not used.
3879       */
3880      $defaults = array(
3881          'file_data_name' => 'async-upload', // Key passed to $_FILE.
3882          'url'            => admin_url( 'async-upload.php', 'relative' ),
3883          'filters'        => array(
3884              'max_file_size' => $max_upload_size . 'b',
3885              'mime_types'    => array( array( 'extensions' => implode( ',', $extensions ) ) ),
3886          ),
3887      );
3888  
3889      /*
3890       * Currently only iOS Safari supports multiple files uploading,
3891       * but iOS 7.x has a bug that prevents uploading of videos when enabled.
3892       * See #29602.
3893       */
3894      if ( wp_is_mobile() && strpos( $_SERVER['HTTP_USER_AGENT'], 'OS 7_' ) !== false &&
3895          strpos( $_SERVER['HTTP_USER_AGENT'], 'like Mac OS X' ) !== false ) {
3896  
3897          $defaults['multi_selection'] = false;
3898      }
3899  
3900      // Check if WebP images can be edited.
3901      if ( ! wp_image_editor_supports( array( 'mime_type' => 'image/webp' ) ) ) {
3902          $defaults['webp_upload_error'] = true;
3903      }
3904  
3905      /**
3906       * Filters the Plupload default settings.
3907       *
3908       * @since 3.4.0
3909       *
3910       * @param array $defaults Default Plupload settings array.
3911       */
3912      $defaults = apply_filters( 'plupload_default_settings', $defaults );
3913  
3914      $params = array(
3915          'action' => 'upload-attachment',
3916      );
3917  
3918      /**
3919       * Filters the Plupload default parameters.
3920       *
3921       * @since 3.4.0
3922       *
3923       * @param array $params Default Plupload parameters array.
3924       */
3925      $params = apply_filters( 'plupload_default_params', $params );
3926  
3927      $params['_wpnonce'] = wp_create_nonce( 'media-form' );
3928  
3929      $defaults['multipart_params'] = $params;
3930  
3931      $settings = array(
3932          'defaults'      => $defaults,
3933          'browser'       => array(
3934              'mobile'    => wp_is_mobile(),
3935              'supported' => _device_can_upload(),
3936          ),
3937          'limitExceeded' => is_multisite() && ! is_upload_space_available(),
3938      );
3939  
3940      $script = 'var _wpPluploadSettings = ' . wp_json_encode( $settings ) . ';';
3941  
3942      if ( $data ) {
3943          $script = "$data\n$script";
3944      }
3945  
3946      $wp_scripts->add_data( 'wp-plupload', 'data', $script );
3947  }
3948  
3949  /**
3950   * Prepares an attachment post object for JS, where it is expected
3951   * to be JSON-encoded and fit into an Attachment model.
3952   *
3953   * @since 3.5.0
3954   *
3955   * @param int|WP_Post $attachment Attachment ID or object.
3956   * @return array|void {
3957   *     Array of attachment details, or void if the parameter does not correspond to an attachment.
3958   *
3959   *     @type string $alt                   Alt text of the attachment.
3960   *     @type string $author                ID of the attachment author, as a string.
3961   *     @type string $authorName            Name of the attachment author.
3962   *     @type string $caption               Caption for the attachment.
3963   *     @type array  $compat                Containing item and meta.
3964   *     @type string $context               Context, whether it's used as the site icon for example.
3965   *     @type int    $date                  Uploaded date, timestamp in milliseconds.
3966   *     @type string $dateFormatted         Formatted date (e.g. June 29, 2018).
3967   *     @type string $description           Description of the attachment.
3968   *     @type string $editLink              URL to the edit page for the attachment.
3969   *     @type string $filename              File name of the attachment.
3970   *     @type string $filesizeHumanReadable Filesize of the attachment in human readable format (e.g. 1 MB).
3971   *     @type int    $filesizeInBytes       Filesize of the attachment in bytes.
3972   *     @type int    $height                If the attachment is an image, represents the height of the image in pixels.
3973   *     @type string $icon                  Icon URL of the attachment (e.g. /wp-includes/images/media/archive.png).
3974   *     @type int    $id                    ID of the attachment.
3975   *     @type string $link                  URL to the attachment.
3976   *     @type int    $menuOrder             Menu order of the attachment post.
3977   *     @type array  $meta                  Meta data for the attachment.
3978   *     @type string $mime                  Mime type of the attachment (e.g. image/jpeg or application/zip).
3979   *     @type int    $modified              Last modified, timestamp in milliseconds.
3980   *     @type string $name                  Name, same as title of the attachment.
3981   *     @type array  $nonces                Nonces for update, delete and edit.
3982   *     @type string $orientation           If the attachment is an image, represents the image orientation
3983   *                                         (landscape or portrait).
3984   *     @type array  $sizes                 If the attachment is an image, contains an array of arrays
3985   *                                         for the images sizes: thumbnail, medium, large, and full.
3986   *     @type string $status                Post status of the attachment (usually 'inherit').
3987   *     @type string $subtype               Mime subtype of the attachment (usually the last part, e.g. jpeg or zip).
3988   *     @type string $title                 Title of the attachment (usually slugified file name without the extension).
3989   *     @type string $type                  Type of the attachment (usually first part of the mime type, e.g. image).
3990   *     @type int    $uploadedTo            Parent post to which the attachment was uploaded.
3991   *     @type string $uploadedToLink        URL to the edit page of the parent post of the attachment.
3992   *     @type string $uploadedToTitle       Post title of the parent of the attachment.
3993   *     @type string $url                   Direct URL to the attachment file (from wp-content).
3994   *     @type int    $width                 If the attachment is an image, represents the width of the image in pixels.
3995   * }
3996   *
3997   */
3998  function wp_prepare_attachment_for_js( $attachment ) {
3999      $attachment = get_post( $attachment );
4000  
4001      if ( ! $attachment ) {
4002          return;
4003      }
4004  
4005      if ( 'attachment' !== $attachment->post_type ) {
4006          return;
4007      }
4008  
4009      $meta = wp_get_attachment_metadata( $attachment->ID );
4010      if ( false !== strpos( $attachment->post_mime_type, '/' ) ) {
4011          list( $type, $subtype ) = explode( '/', $attachment->post_mime_type );
4012      } else {
4013          list( $type, $subtype ) = array( $attachment->post_mime_type, '' );
4014      }
4015  
4016      $attachment_url = wp_get_attachment_url( $attachment->ID );
4017      $base_url       = str_replace( wp_basename( $attachment_url ), '', $attachment_url );
4018  
4019      $response = array(
4020          'id'            => $attachment->ID,
4021          'title'         => $attachment->post_title,
4022          'filename'      => wp_basename( get_attached_file( $attachment->ID ) ),
4023          'url'           => $attachment_url,
4024          'link'          => get_attachment_link( $attachment->ID ),
4025          'alt'           => get_post_meta( $attachment->ID, '_wp_attachment_image_alt', true ),
4026          'author'        => $attachment->post_author,
4027          'description'   => $attachment->post_content,
4028          'caption'       => $attachment->post_excerpt,
4029          'name'          => $attachment->post_name,
4030          'status'        => $attachment->post_status,
4031          'uploadedTo'    => $attachment->post_parent,
4032          'date'          => strtotime( $attachment->post_date_gmt ) * 1000,
4033          'modified'      => strtotime( $attachment->post_modified_gmt ) * 1000,
4034          'menuOrder'     => $attachment->menu_order,
4035          'mime'          => $attachment->post_mime_type,
4036          'type'          => $type,
4037          'subtype'       => $subtype,
4038          'icon'          => wp_mime_type_icon( $attachment->ID ),
4039          'dateFormatted' => mysql2date( __( 'F j, Y' ), $attachment->post_date ),
4040          'nonces'        => array(
4041              'update' => false,
4042              'delete' => false,
4043              'edit'   => false,
4044          ),
4045          'editLink'      => false,
4046          'meta'          => false,
4047      );
4048  
4049      $author = new WP_User( $attachment->post_author );
4050  
4051      if ( $author->exists() ) {
4052          $author_name            = $author->display_name ? $author->display_name : $author->nickname;
4053          $response['authorName'] = html_entity_decode( $author_name, ENT_QUOTES, get_bloginfo( 'charset' ) );
4054          $response['authorLink'] = get_edit_user_link( $author->ID );
4055      } else {
4056          $response['authorName'] = __( '(no author)' );
4057      }
4058  
4059      if ( $attachment->post_parent ) {
4060          $post_parent = get_post( $attachment->post_parent );
4061          if ( $post_parent ) {
4062              $response['uploadedToTitle'] = $post_parent->post_title ? $post_parent->post_title : __( '(no title)' );
4063              $response['uploadedToLink']  = get_edit_post_link( $attachment->post_parent, 'raw' );
4064          }
4065      }
4066  
4067      $attached_file = get_attached_file( $attachment->ID );
4068  
4069      if ( isset( $meta['filesize'] ) ) {
4070          $bytes = $meta['filesize'];
4071      } elseif ( file_exists( $attached_file ) ) {
4072          $bytes = wp_filesize( $attached_file );
4073      } else {
4074          $bytes = '';
4075      }
4076  
4077      if ( $bytes ) {
4078          $response['filesizeInBytes']       = $bytes;
4079          $response['filesizeHumanReadable'] = size_format( $bytes );
4080      }
4081  
4082      $context             = get_post_meta( $attachment->ID, '_wp_attachment_context', true );
4083      $response['context'] = ( $context ) ? $context : '';
4084  
4085      if ( current_user_can( 'edit_post', $attachment->ID ) ) {
4086          $response['nonces']['update'] = wp_create_nonce( 'update-post_' . $attachment->ID );
4087          $response['nonces']['edit']   = wp_create_nonce( 'image_editor-' . $attachment->ID );
4088          $response['editLink']         = get_edit_post_link( $attachment->ID, 'raw' );
4089      }
4090  
4091      if ( current_user_can( 'delete_post', $attachment->ID ) ) {
4092          $response['nonces']['delete'] = wp_create_nonce( 'delete-post_' . $attachment->ID );
4093      }
4094  
4095      if ( $meta && ( 'image' === $type || ! empty( $meta['sizes'] ) ) ) {
4096          $sizes = array();
4097  
4098          /** This filter is documented in wp-admin/includes/media.php */
4099          $possible_sizes = apply_filters(
4100              'image_size_names_choose',
4101              array(
4102                  'thumbnail' => __( 'Thumbnail' ),
4103                  'medium'    => __( 'Medium' ),
4104                  'large'     => __( 'Large' ),
4105                  'full'      => __( 'Full Size' ),
4106              )
4107          );
4108          unset( $possible_sizes['full'] );
4109  
4110          /*
4111           * Loop through all potential sizes that may be chosen. Try to do this with some efficiency.
4112           * First: run the image_downsize filter. If it returns something, we can use its data.
4113           * If the filter does not return something, then image_downsize() is just an expensive way
4114           * to check the image metadata, which we do second.
4115           */
4116          foreach ( $possible_sizes as $size => $label ) {
4117  
4118              /** This filter is documented in wp-includes/media.php */
4119              $downsize = apply_filters( 'image_downsize', false, $attachment->ID, $size );
4120  
4121              if ( $downsize ) {
4122                  if ( empty( $downsize[3] ) ) {
4123                      continue;
4124                  }
4125  
4126                  $sizes[ $size ] = array(
4127                      'height'      => $downsize[2],
4128                      'width'       => $downsize[1],
4129                      'url'         => $downsize[0],
4130                      'orientation' => $downsize[2] > $downsize[1] ? 'portrait' : 'landscape',
4131                  );
4132              } elseif ( isset( $meta['sizes'][ $size ] ) ) {
4133                  // Nothing from the filter, so consult image metadata if we have it.
4134                  $size_meta = $meta['sizes'][ $size ];
4135  
4136                  // We have the actual image size, but might need to further constrain it if content_width is narrower.
4137                  // Thumbnail, medium, and full sizes are also checked against the site's height/width options.
4138                  list( $width, $height ) = image_constrain_size_for_editor( $size_meta['width'], $size_meta['height'], $size, 'edit' );
4139  
4140                  $sizes[ $size ] = array(
4141                      'height'      => $height,
4142                      'width'       => $width,
4143                      'url'         => $base_url . $size_meta['file'],
4144                      'orientation' => $height > $width ? 'portrait' : 'landscape',
4145                  );
4146              }
4147          }
4148  
4149          if ( 'image' === $type ) {
4150              if ( ! empty( $meta['original_image'] ) ) {
4151                  $response['originalImageURL']  = wp_get_original_image_url( $attachment->ID );
4152                  $response['originalImageName'] = wp_basename( wp_get_original_image_path( $attachment->ID ) );
4153              }
4154  
4155              $sizes['full'] = array( 'url' => $attachment_url );
4156  
4157              if ( isset( $meta['height'], $meta['width'] ) ) {
4158                  $sizes['full']['height']      = $meta['height'];
4159                  $sizes['full']['width']       = $meta['width'];
4160                  $sizes['full']['orientation'] = $meta['height'] > $meta['width'] ? 'portrait' : 'landscape';
4161              }
4162  
4163              $response = array_merge( $response, $sizes['full'] );
4164          } elseif ( $meta['sizes']['full']['file'] ) {
4165              $sizes['full'] = array(
4166                  'url'         => $base_url . $meta['sizes']['full']['file'],
4167                  'height'      => $meta['sizes']['full']['height'],
4168                  'width'       => $meta['sizes']['full']['width'],
4169                  'orientation' => $meta['sizes']['full']['height'] > $meta['sizes']['full']['width'] ? 'portrait' : 'landscape',
4170              );
4171          }
4172  
4173          $response = array_merge( $response, array( 'sizes' => $sizes ) );
4174      }
4175  
4176      if ( $meta && 'video' === $type ) {
4177          if ( isset( $meta['width'] ) ) {
4178              $response['width'] = (int) $meta['width'];
4179          }
4180          if ( isset( $meta['height'] ) ) {
4181              $response['height'] = (int) $meta['height'];
4182          }
4183      }
4184  
4185      if ( $meta && ( 'audio' === $type || 'video' === $type ) ) {
4186          if ( isset( $meta['length_formatted'] ) ) {
4187              $response['fileLength']              = $meta['length_formatted'];
4188              $response['fileLengthHumanReadable'] = human_readable_duration( $meta['length_formatted'] );
4189          }
4190  
4191          $response['meta'] = array();
4192          foreach ( wp_get_attachment_id3_keys( $attachment, 'js' ) as $key => $label ) {
4193              $response['meta'][ $key ] = false;
4194  
4195              if ( ! empty( $meta[ $key ] ) ) {
4196                  $response['meta'][ $key ] = $meta[ $key ];
4197              }
4198          }
4199  
4200          $id = get_post_thumbnail_id( $attachment->ID );
4201          if ( ! empty( $id ) ) {
4202              list( $src, $width, $height ) = wp_get_attachment_image_src( $id, 'full' );
4203              $response['image']            = compact( 'src', 'width', 'height' );
4204              list( $src, $width, $height ) = wp_get_attachment_image_src( $id, 'thumbnail' );
4205              $response['thumb']            = compact( 'src', 'width', 'height' );
4206          } else {
4207              $src               = wp_mime_type_icon( $attachment->ID );
4208              $width             = 48;
4209              $height            = 64;
4210              $response['image'] = compact( 'src', 'width', 'height' );
4211              $response['thumb'] = compact( 'src', 'width', 'height' );
4212          }
4213      }
4214  
4215      if ( function_exists( 'get_compat_media_markup' ) ) {
4216          $response['compat'] = get_compat_media_markup( $attachment->ID, array( 'in_modal' => true ) );
4217      }
4218  
4219      if ( function_exists( 'get_media_states' ) ) {
4220          $media_states = get_media_states( $attachment );
4221          if ( ! empty( $media_states ) ) {
4222              $response['mediaStates'] = implode( ', ', $media_states );
4223          }
4224      }
4225  
4226      /**
4227       * Filters the attachment data prepared for JavaScript.
4228       *
4229       * @since 3.5.0
4230       *
4231       * @param array       $response   Array of prepared attachment data. @see wp_prepare_attachment_for_js().
4232       * @param WP_Post     $attachment Attachment object.
4233       * @param array|false $meta       Array of attachment meta data, or false if there is none.
4234       */
4235      return apply_filters( 'wp_prepare_attachment_for_js', $response, $attachment, $meta );
4236  }
4237  
4238  /**
4239   * Enqueues all scripts, styles, settings, and templates necessary to use
4240   * all media JS APIs.
4241   *
4242   * @since 3.5.0
4243   *
4244   * @global int       $content_width
4245   * @global wpdb      $wpdb          WordPress database abstraction object.
4246   * @global WP_Locale $wp_locale     WordPress date and time locale object.
4247   *
4248   * @param array $args {
4249   *     Arguments for enqueuing media scripts.
4250   *
4251   *     @type int|WP_Post $post A post object or ID.
4252   * }
4253   */
4254  function wp_enqueue_media( $args = array() ) {
4255      // Enqueue me just once per page, please.
4256      if ( did_action( 'wp_enqueue_media' ) ) {
4257          return;
4258      }
4259  
4260      global $content_width, $wpdb, $wp_locale;
4261  
4262      $defaults = array(
4263          'post' => null,
4264      );
4265      $args     = wp_parse_args( $args, $defaults );
4266  
4267      // We're going to pass the old thickbox media tabs to `media_upload_tabs`
4268      // to ensure plugins will work. We will then unset those tabs.
4269      $tabs = array(
4270          // handler action suffix => tab label
4271          'type'     => '',
4272          'type_url' => '',
4273          'gallery'  => '',
4274          'library'  => '',
4275      );
4276  
4277      /** This filter is documented in wp-admin/includes/media.php */
4278      $tabs = apply_filters( 'media_upload_tabs', $tabs );
4279      unset( $tabs['type'], $tabs['type_url'], $tabs['gallery'], $tabs['library'] );
4280  
4281      $props = array(
4282          'link'  => get_option( 'image_default_link_type' ), // DB default is 'file'.
4283          'align' => get_option( 'image_default_align' ),     // Empty default.
4284          'size'  => get_option( 'image_default_size' ),      // Empty default.
4285      );
4286  
4287      $exts      = array_merge( wp_get_audio_extensions(), wp_get_video_extensions() );
4288      $mimes     = get_allowed_mime_types();
4289      $ext_mimes = array();
4290      foreach ( $exts as $ext ) {
4291          foreach ( $mimes as $ext_preg => $mime_match ) {
4292              if ( preg_match( '#' . $ext . '#i', $ext_preg ) ) {
4293                  $ext_mimes[ $ext ] = $mime_match;
4294                  break;
4295              }
4296          }
4297      }
4298  
4299      /**
4300       * Allows showing or hiding the "Create Audio Playlist" button in the media library.
4301       *
4302       * By default, the "Create Audio Playlist" button will always be shown in
4303       * the media library.  If this filter returns `null`, a query will be run
4304       * to determine whether the media library contains any audio items.  This
4305       * was the default behavior prior to version 4.8.0, but this query is
4306       * expensive for large media libraries.
4307       *
4308       * @since 4.7.4
4309       * @since 4.8.0 The filter's default value is `true` rather than `null`.
4310       *
4311       * @link https://core.trac.wordpress.org/ticket/31071
4312       *
4313       * @param bool|null $show Whether to show the button, or `null` to decide based
4314       *                        on whether any audio files exist in the media library.
4315       */
4316      $show_audio_playlist = apply_filters( 'media_library_show_audio_playlist', true );
4317      if ( null === $show_audio_playlist ) {
4318          $show_audio_playlist = $wpdb->get_var(
4319              "
4320              SELECT ID
4321              FROM $wpdb->posts
4322              WHERE post_type = 'attachment'
4323              AND post_mime_type LIKE 'audio%'
4324              LIMIT 1
4325          "
4326          );
4327      }
4328  
4329      /**
4330       * Allows showing or hiding the "Create Video Playlist" button in the media library.
4331       *
4332       * By default, the "Create Video Playlist" button will always be shown in
4333       * the media library.  If this filter returns `null`, a query will be run
4334       * to determine whether the media library contains any video items.  This
4335       * was the default behavior prior to version 4.8.0, but this query is
4336       * expensive for large media libraries.
4337       *
4338       * @since 4.7.4
4339       * @since 4.8.0 The filter's default value is `true` rather than `null`.
4340       *
4341       * @link https://core.trac.wordpress.org/ticket/31071
4342       *
4343       * @param bool|null $show Whether to show the button, or `null` to decide based
4344       *                        on whether any video files exist in the media library.
4345       */
4346      $show_video_playlist = apply_filters( 'media_library_show_video_playlist', true );
4347      if ( null === $show_video_playlist ) {
4348          $show_video_playlist = $wpdb->get_var(
4349              "
4350              SELECT ID
4351              FROM $wpdb->posts
4352              WHERE post_type = 'attachment'
4353              AND post_mime_type LIKE 'video%'
4354              LIMIT 1
4355          "
4356          );
4357      }
4358  
4359      /**
4360       * Allows overriding the list of months displayed in the media library.
4361       *
4362       * By default (if this filter does not return an array), a query will be
4363       * run to determine the months that have media items.  This query can be
4364       * expensive for large media libraries, so it may be desirable for sites to
4365       * override this behavior.
4366       *
4367       * @since 4.7.4
4368       *
4369       * @link https://core.trac.wordpress.org/ticket/31071
4370       *
4371       * @param array|null $months An array of objects with `month` and `year`
4372       *                           properties, or `null` (or any other non-array value)
4373       *                           for default behavior.
4374       */
4375      $months = apply_filters( 'media_library_months_with_files', null );
4376      if ( ! is_array( $months ) ) {
4377          $months = $wpdb->get_results(
4378              $wpdb->prepare(
4379                  "
4380              SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month
4381              FROM $wpdb->posts
4382              WHERE post_type = %s
4383              ORDER BY post_date DESC
4384          ",
4385                  'attachment'
4386              )
4387          );
4388      }
4389      foreach ( $months as $month_year ) {
4390          $month_year->text = sprintf(
4391              /* translators: 1: Month, 2: Year. */
4392              __( '%1$s %2$d' ),
4393              $wp_locale->get_month( $month_year->month ),
4394              $month_year->year
4395          );
4396      }
4397  
4398      /**
4399       * Filters whether the Media Library grid has infinite scrolling. Default `false`.
4400       *
4401       * @since 5.8.0
4402       *
4403       * @param bool $infinite Whether the Media Library grid has infinite scrolling.
4404       */
4405      $infinite_scrolling = apply_filters( 'media_library_infinite_scrolling', false );
4406  
4407      $settings = array(
4408          'tabs'              => $tabs,
4409          'tabUrl'            => add_query_arg( array( 'chromeless' => true ), admin_url( 'media-upload.php' ) ),
4410          'mimeTypes'         => wp_list_pluck( get_post_mime_types(), 0 ),
4411          /** This filter is documented in wp-admin/includes/media.php */
4412          'captions'          => ! apply_filters( 'disable_captions', '' ),
4413          'nonce'             => array(
4414              'sendToEditor' => wp_create_nonce( 'media-send-to-editor' ),
4415          ),
4416          'post'              => array(
4417              'id' => 0,
4418          ),
4419          'defaultProps'      => $props,
4420          'attachmentCounts'  => array(
4421              'audio' => ( $show_audio_playlist ) ? 1 : 0,
4422              'video' => ( $show_video_playlist ) ? 1 : 0,
4423          ),
4424          'oEmbedProxyUrl'    => rest_url( 'oembed/1.0/proxy' ),
4425          'embedExts'         => $exts,
4426          'embedMimes'        => $ext_mimes,
4427          'contentWidth'      => $content_width,
4428          'months'            => $months,
4429          'mediaTrash'        => MEDIA_TRASH ? 1 : 0,
4430          'infiniteScrolling' => ( $infinite_scrolling ) ? 1 : 0,
4431      );
4432  
4433      $post = null;
4434      if ( isset( $args['post'] ) ) {
4435          $post             = get_post( $args['post'] );
4436          $settings['post'] = array(
4437              'id'    => $post->ID,
4438              'nonce' => wp_create_nonce( 'update-post_' . $post->ID ),
4439          );
4440  
4441          $thumbnail_support = current_theme_supports( 'post-thumbnails', $post->post_type ) && post_type_supports( $post->post_type, 'thumbnail' );
4442          if ( ! $thumbnail_support && 'attachment' === $post->post_type && $post->post_mime_type ) {
4443              if ( wp_attachment_is( 'audio', $post ) ) {
4444                  $thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );
4445              } elseif ( wp_attachment_is( 'video', $post ) ) {
4446                  $thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
4447              }
4448          }
4449  
4450          if ( $thumbnail_support ) {
4451              $featured_image_id                   = get_post_meta( $post->ID, '_thumbnail_id', true );
4452              $settings['post']['featuredImageId'] = $featured_image_id ? $featured_image_id : -1;
4453          }
4454      }
4455  
4456      if ( $post ) {
4457          $post_type_object = get_post_type_object( $post->post_type );
4458      } else {
4459          $post_type_object = get_post_type_object( 'post' );
4460      }
4461  
4462      $strings = array(
4463          // Generic.
4464          'mediaFrameDefaultTitle'      => __( 'Media' ),
4465          'url'                         => __( 'URL' ),
4466          'addMedia'                    => __( 'Add media' ),
4467          'search'                      => __( 'Search' ),
4468          'select'                      => __( 'Select' ),
4469          'cancel'                      => __( 'Cancel' ),
4470          'update'                      => __( 'Update' ),
4471          'replace'                     => __( 'Replace' ),
4472          'remove'                      => __( 'Remove' ),
4473          'back'                        => __( 'Back' ),
4474          /*
4475           * translators: This is a would-be plural string used in the media manager.
4476           * If there is not a word you can use in your language to avoid issues with the
4477           * lack of plural support here, turn it into "selected: %d" then translate it.
4478           */
4479          'selected'                    => __( '%d selected' ),
4480          'dragInfo'                    => __( 'Drag and drop to reorder media files.' ),
4481  
4482          // Upload.
4483          'uploadFilesTitle'            => __( 'Upload files' ),
4484          'uploadImagesTitle'           => __( 'Upload images' ),
4485  
4486          // Library.
4487          'mediaLibraryTitle'           => __( 'Media Library' ),
4488          'insertMediaTitle'            => __( 'Add media' ),
4489          'createNewGallery'            => __( 'Create a new gallery' ),
4490          'createNewPlaylist'           => __( 'Create a new playlist' ),
4491          'createNewVideoPlaylist'      => __( 'Create a new video playlist' ),
4492          'returnToLibrary'             => __( '&#8592; Go to library' ),
4493          'allMediaItems'               => __( 'All media items' ),
4494          'allDates'                    => __( 'All dates' ),
4495          'noItemsFound'                => __( 'No items found.' ),
4496          'insertIntoPost'              => $post_type_object->labels->insert_into_item,
4497          'unattached'                  => _x( 'Unattached', 'media items' ),
4498          'mine'                        => _x( 'Mine', 'media items' ),
4499          'trash'                       => _x( 'Trash', 'noun' ),
4500          'uploadedToThisPost'          => $post_type_object->labels->uploaded_to_this_item,
4501          'warnDelete'                  => __( "You are about to permanently delete this item from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
4502          'warnBulkDelete'              => __( "You are about to permanently delete these items from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
4503          'warnBulkTrash'               => __( "You are about to trash these items.\n  'Cancel' to stop, 'OK' to delete." ),
4504          'bulkSelect'                  => __( 'Bulk select' ),
4505          'trashSelected'               => __( 'Move to Trash' ),
4506          'restoreSelected'             => __( 'Restore from Trash' ),
4507          'deletePermanently'           => __( 'Delete permanently' ),
4508          'errorDeleting'               => __( 'Error in deleting the attachment.' ),
4509          'apply'                       => __( 'Apply' ),
4510          'filterByDate'                => __( 'Filter by date' ),
4511          'filterByType'                => __( 'Filter by type' ),
4512          'searchLabel'                 => __( 'Search' ),
4513          'searchMediaLabel'            => __( 'Search media' ),          // Backward compatibility pre-5.3.
4514          'searchMediaPlaceholder'      => __( 'Search media items...' ), // Placeholder (no ellipsis), backward compatibility pre-5.3.
4515          /* translators: %d: Number of attachments found in a search. */
4516          'mediaFound'                  => __( 'Number of media items found: %d' ),
4517          'noMedia'                     => __( 'No media items found.' ),
4518          'noMediaTryNewSearch'         => __( 'No media items found. Try a different search.' ),
4519  
4520          // Library Details.
4521          'attachmentDetails'           => __( 'Attachment details' ),
4522  
4523          // From URL.
4524          'insertFromUrlTitle'          => __( 'Insert from URL' ),
4525  
4526          // Featured Images.
4527          'setFeaturedImageTitle'       => $post_type_object->labels->featured_image,
4528          'setFeaturedImage'            => $post_type_object->labels->set_featured_image,
4529  
4530          // Gallery.
4531          'createGalleryTitle'          => __( 'Create gallery' ),
4532          'editGalleryTitle'            => __( 'Edit gallery' ),
4533          'cancelGalleryTitle'          => __( '&#8592; Cancel gallery' ),
4534          'insertGallery'               => __( 'Insert gallery' ),
4535          'updateGallery'               => __( 'Update gallery' ),
4536          'addToGallery'                => __( 'Add to gallery' ),
4537          'addToGalleryTitle'           => __( 'Add to gallery' ),
4538          'reverseOrder'                => __( 'Reverse order' ),
4539  
4540          // Edit Image.
4541          'imageDetailsTitle'           => __( 'Image details' ),
4542          'imageReplaceTitle'           => __( 'Replace image' ),
4543          'imageDetailsCancel'          => __( 'Cancel edit' ),
4544          'editImage'                   => __( 'Edit image' ),
4545  
4546          // Crop Image.
4547          'chooseImage'                 => __( 'Choose image' ),
4548          'selectAndCrop'               => __( 'Select and crop' ),
4549          'skipCropping'                => __( 'Skip cropping' ),
4550          'cropImage'                   => __( 'Crop image' ),
4551          'cropYourImage'               => __( 'Crop your image' ),
4552          'cropping'                    => __( 'Cropping&hellip;' ),
4553          /* translators: 1: Suggested width number, 2: Suggested height number. */
4554          'suggestedDimensions'         => __( 'Suggested image dimensions: %1$s by %2$s pixels.' ),
4555          'cropError'                   => __( 'There has been an error cropping your image.' ),
4556  
4557          // Edit Audio.
4558          'audioDetailsTitle'           => __( 'Audio details' ),
4559          'audioReplaceTitle'           => __( 'Replace audio' ),
4560          'audioAddSourceTitle'         => __( 'Add audio source' ),
4561          'audioDetailsCancel'          => __( 'Cancel edit' ),
4562  
4563          // Edit Video.
4564          'videoDetailsTitle'           => __( 'Video details' ),
4565          'videoReplaceTitle'           => __( 'Replace video' ),
4566          'videoAddSourceTitle'         => __( 'Add video source' ),
4567          'videoDetailsCancel'          => __( 'Cancel edit' ),
4568          'videoSelectPosterImageTitle' => __( 'Select poster image' ),
4569          'videoAddTrackTitle'          => __( 'Add subtitles' ),
4570  
4571          // Playlist.
4572          'playlistDragInfo'            => __( 'Drag and drop to reorder tracks.' ),
4573          'createPlaylistTitle'         => __( 'Create audio playlist' ),
4574          'editPlaylistTitle'           => __( 'Edit audio playlist' ),
4575          'cancelPlaylistTitle'         => __( '&#8592; Cancel audio playlist' ),
4576          'insertPlaylist'              => __( 'Insert audio playlist' ),
4577          'updatePlaylist'              => __( 'Update audio playlist' ),
4578          'addToPlaylist'               => __( 'Add to audio playlist' ),
4579          'addToPlaylistTitle'          => __( 'Add to Audio Playlist' ),
4580  
4581          // Video Playlist.
4582          'videoPlaylistDragInfo'       => __( 'Drag and drop to reorder videos.' ),
4583          'createVideoPlaylistTitle'    => __( 'Create video playlist' ),
4584          'editVideoPlaylistTitle'      => __( 'Edit video playlist' ),
4585          'cancelVideoPlaylistTitle'    => __( '&#8592; Cancel video playlist' ),
4586          'insertVideoPlaylist'         => __( 'Insert video playlist' ),
4587          'updateVideoPlaylist'         => __( 'Update video playlist' ),
4588          'addToVideoPlaylist'          => __( 'Add to video playlist' ),
4589          'addToVideoPlaylistTitle'     => __( 'Add to video Playlist' ),
4590  
4591          // Headings.
4592          'filterAttachments'           => __( 'Filter media' ),
4593          'attachmentsList'             => __( 'Media list' ),
4594      );
4595  
4596      /**
4597       * Filters the media view settings.
4598       *
4599       * @since 3.5.0
4600       *
4601       * @param array   $settings List of media view settings.
4602       * @param WP_Post $post     Post object.
4603       */
4604      $settings = apply_filters( 'media_view_settings', $settings, $post );
4605  
4606      /**
4607       * Filters the media view strings.
4608       *
4609       * @since 3.5.0
4610       *
4611       * @param string[] $strings Array of media view strings keyed by the name they'll be referenced by in JavaScript.
4612       * @param WP_Post  $post    Post object.
4613       */
4614      $strings = apply_filters( 'media_view_strings', $strings, $post );
4615  
4616      $strings['settings'] = $settings;
4617  
4618      // Ensure we enqueue media-editor first, that way media-views
4619      // is registered internally before we try to localize it. See #24724.
4620      wp_enqueue_script( 'media-editor' );
4621      wp_localize_script( 'media-views', '_wpMediaViewsL10n', $strings );
4622  
4623      wp_enqueue_script( 'media-audiovideo' );
4624      wp_enqueue_style( 'media-views' );
4625      if ( is_admin() ) {
4626          wp_enqueue_script( 'mce-view' );
4627          wp_enqueue_script( 'image-edit' );
4628      }
4629      wp_enqueue_style( 'imgareaselect' );
4630      wp_plupload_default_settings();
4631  
4632      require_once  ABSPATH . WPINC . '/media-template.php';
4633      add_action( 'admin_footer', 'wp_print_media_templates' );
4634      add_action( 'wp_footer', 'wp_print_media_templates' );
4635      add_action( 'customize_controls_print_footer_scripts', 'wp_print_media_templates' );
4636  
4637      /**
4638       * Fires at the conclusion of wp_enqueue_media().
4639       *
4640       * @since 3.5.0
4641       */
4642      do_action( 'wp_enqueue_media' );
4643  }
4644  
4645  /**
4646   * Retrieves media attached to the passed post.
4647   *
4648   * @since 3.6.0
4649   *
4650   * @param string      $type Mime type.
4651   * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
4652   * @return WP_Post[] Array of media attached to the given post.
4653   */
4654  function get_attached_media( $type, $post = 0 ) {
4655      $post = get_post( $post );
4656  
4657      if ( ! $post ) {
4658          return array();
4659      }
4660  
4661      $args = array(
4662          'post_parent'    => $post->ID,
4663          'post_type'      => 'attachment',
4664          'post_mime_type' => $type,
4665          'posts_per_page' => -1,
4666          'orderby'        => 'menu_order',
4667          'order'          => 'ASC',
4668      );
4669  
4670      /**
4671       * Filters arguments used to retrieve media attached to the given post.
4672       *
4673       * @since 3.6.0
4674       *
4675       * @param array   $args Post query arguments.
4676       * @param string  $type Mime type of the desired media.
4677       * @param WP_Post $post Post object.
4678       */
4679      $args = apply_filters( 'get_attached_media_args', $args, $type, $post );
4680  
4681      $children = get_children( $args );
4682  
4683      /**
4684       * Filters the list of media attached to the given post.
4685       *
4686       * @since 3.6.0
4687       *
4688       * @param WP_Post[] $children Array of media attached to the given post.
4689       * @param string    $type     Mime type of the media desired.
4690       * @param WP_Post   $post     Post object.
4691       */
4692      return (array) apply_filters( 'get_attached_media', $children, $type, $post );
4693  }
4694  
4695  /**
4696   * Check the content HTML for a audio, video, object, embed, or iframe tags.
4697   *
4698   * @since 3.6.0
4699   *
4700   * @param string   $content A string of HTML which might contain media elements.
4701   * @param string[] $types   An array of media types: 'audio', 'video', 'object', 'embed', or 'iframe'.
4702   * @return string[] Array of found HTML media elements.
4703   */
4704  function get_media_embedded_in_content( $content, $types = null ) {
4705      $html = array();
4706  
4707      /**
4708       * Filters the embedded media types that are allowed to be returned from the content blob.
4709       *
4710       * @since 4.2.0
4711       *
4712       * @param string[] $allowed_media_types An array of allowed media types. Default media types are
4713       *                                      'audio', 'video', 'object', 'embed', and 'iframe'.
4714       */
4715      $allowed_media_types = apply_filters( 'media_embedded_in_content_allowed_types', array( 'audio', 'video', 'object', 'embed', 'iframe' ) );
4716  
4717      if ( ! empty( $types ) ) {
4718          if ( ! is_array( $types ) ) {
4719              $types = array( $types );
4720          }
4721  
4722          $allowed_media_types = array_intersect( $allowed_media_types, $types );
4723      }
4724  
4725      $tags = implode( '|', $allowed_media_types );
4726  
4727      if ( preg_match_all( '#<(?P<tag>' . $tags . ')[^<]*?(?:>[\s\S]*?<\/(?P=tag)>|\s*\/>)#', $content, $matches ) ) {
4728          foreach ( $matches[0] as $match ) {
4729              $html[] = $match;
4730          }
4731      }
4732  
4733      return $html;
4734  }
4735  
4736  /**
4737   * Retrieves galleries from the passed post's content.
4738   *
4739   * @since 3.6.0
4740   *
4741   * @param int|WP_Post $post Post ID or object.
4742   * @param bool        $html Optional. Whether to return HTML or data in the array. Default true.
4743   * @return array A list of arrays, each containing gallery data and srcs parsed
4744   *               from the expanded shortcode.
4745   */
4746  function get_post_galleries( $post, $html = true ) {
4747      $post = get_post( $post );
4748  
4749      if ( ! $post ) {
4750          return array();
4751      }
4752  
4753      if ( ! has_shortcode( $post->post_content, 'gallery' ) && ! has_block( 'gallery', $post->post_content ) ) {
4754          return array();
4755      }
4756  
4757      $galleries = array();
4758      if ( preg_match_all( '/' . get_shortcode_regex() . '/s', $post->post_content, $matches, PREG_SET_ORDER ) ) {
4759          foreach ( $matches as $shortcode ) {
4760              if ( 'gallery' === $shortcode[2] ) {
4761                  $srcs = array();
4762  
4763                  $shortcode_attrs = shortcode_parse_atts( $shortcode[3] );
4764                  if ( ! is_array( $shortcode_attrs ) ) {
4765                      $shortcode_attrs = array();
4766                  }
4767  
4768                  // Specify the post ID of the gallery we're viewing if the shortcode doesn't reference another post already.
4769                  if ( ! isset( $shortcode_attrs['id'] ) ) {
4770                      $shortcode[3] .= ' id="' . (int) $post->ID . '"';
4771                  }
4772  
4773                  $gallery = do_shortcode_tag( $shortcode );
4774                  if ( $html ) {
4775                      $galleries[] = $gallery;
4776                  } else {
4777                      preg_match_all( '#src=([\'"])(.+?)\1#is', $gallery, $src, PREG_SET_ORDER );
4778                      if ( ! empty( $src ) ) {
4779                          foreach ( $src as $s ) {
4780                              $srcs[] = $s[2];
4781                          }
4782                      }
4783  
4784                      $galleries[] = array_merge(
4785                          $shortcode_attrs,
4786                          array(
4787                              'src' => array_values( array_unique( $srcs ) ),
4788                          )
4789                      );
4790                  }
4791              }
4792          }
4793      }
4794  
4795      if ( has_block( 'gallery', $post->post_content ) ) {
4796          $post_blocks = parse_blocks( $post->post_content );
4797  
4798          while ( $block = array_shift( $post_blocks ) ) {
4799              $has_inner_blocks = ! empty( $block['innerBlocks'] );
4800  
4801              // Skip blocks with no blockName and no innerHTML.
4802              if ( ! $block['blockName'] ) {
4803                  continue;
4804              }
4805  
4806              // Skip non-Gallery blocks.
4807              if ( 'core/gallery' !== $block['blockName'] ) {
4808                  // Move inner blocks into the root array before skipping.
4809                  if ( $has_inner_blocks ) {
4810                      array_push( $post_blocks, ...$block['innerBlocks'] );
4811                  }
4812                  continue;
4813              }
4814  
4815              // New Gallery block format as HTML.
4816              if ( $has_inner_blocks && $html ) {
4817                  $block_html  = wp_list_pluck( $block['innerBlocks'], 'innerHTML' );
4818                  $galleries[] = '<figure>' . implode( ' ', $block_html ) . '</figure>';
4819                  continue;
4820              }
4821  
4822              $srcs = array();
4823  
4824              // New Gallery block format as an array.
4825              if ( $has_inner_blocks ) {
4826                  $attrs = wp_list_pluck( $block['innerBlocks'], 'attrs' );
4827                  $ids   = wp_list_pluck( $attrs, 'id' );
4828  
4829                  foreach ( $ids as $id ) {
4830                      $url = wp_get_attachment_url( $id );
4831  
4832                      if ( is_string( $url ) && ! in_array( $url, $srcs, true ) ) {
4833                          $srcs[] = $url;
4834                      }
4835                  }
4836  
4837                  $galleries[] = array(
4838                      'ids' => implode( ',', $ids ),
4839                      'src' => $srcs,
4840                  );
4841  
4842                  continue;
4843              }
4844  
4845              // Old Gallery block format as HTML.
4846              if ( $html ) {
4847                  $galleries[] = $block['innerHTML'];
4848                  continue;
4849              }
4850