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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_attr( $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 the registered image sub-sizes.
 886   */
 887  function wp_get_registered_image_subsizes() {
 888      $additional_sizes = wp_get_additional_image_sizes();
 889      $all_sizes        = array();
 890  
 891      foreach ( get_intermediate_image_sizes() as $size_name ) {
 892          $size_data = array(
 893              'width'  => 0,
 894              'height' => 0,
 895              'crop'   => false,
 896          );
 897  
 898          if ( isset( $additional_sizes[ $size_name ]['width'] ) ) {
 899              // For sizes added by plugins and themes.
 900              $size_data['width'] = (int) $additional_sizes[ $size_name ]['width'];
 901          } else {
 902              // For default sizes set in options.
 903              $size_data['width'] = (int) get_option( "{$size_name}_size_w" );
 904          }
 905  
 906          if ( isset( $additional_sizes[ $size_name ]['height'] ) ) {
 907              $size_data['height'] = (int) $additional_sizes[ $size_name ]['height'];
 908          } else {
 909              $size_data['height'] = (int) get_option( "{$size_name}_size_h" );
 910          }
 911  
 912          if ( empty( $size_data['width'] ) && empty( $size_data['height'] ) ) {
 913              // This size isn't set.
 914              continue;
 915          }
 916  
 917          if ( isset( $additional_sizes[ $size_name ]['crop'] ) ) {
 918              $size_data['crop'] = $additional_sizes[ $size_name ]['crop'];
 919          } else {
 920              $size_data['crop'] = get_option( "{$size_name}_crop" );
 921          }
 922  
 923          if ( ! is_array( $size_data['crop'] ) || empty( $size_data['crop'] ) ) {
 924              $size_data['crop'] = (bool) $size_data['crop'];
 925          }
 926  
 927          $all_sizes[ $size_name ] = $size_data;
 928      }
 929  
 930      return $all_sizes;
 931  }
 932  
 933  /**
 934   * Retrieves an image to represent an attachment.
 935   *
 936   * @since 2.5.0
 937   *
 938   * @param int          $attachment_id Image attachment ID.
 939   * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array of
 940   *                                    width and height values in pixels (in that order). Default 'thumbnail'.
 941   * @param bool         $icon          Optional. Whether the image should fall back to a mime type icon. Default false.
 942   * @return array|false {
 943   *     Array of image data, or boolean false if no image is available.
 944   *
 945   *     @type string $0 Image source URL.
 946   *     @type int    $1 Image width in pixels.
 947   *     @type int    $2 Image height in pixels.
 948   *     @type bool   $3 Whether the image is a resized image.
 949   * }
 950   */
 951  function wp_get_attachment_image_src( $attachment_id, $size = 'thumbnail', $icon = false ) {
 952      // Get a thumbnail or intermediate image if there is one.
 953      $image = image_downsize( $attachment_id, $size );
 954      if ( ! $image ) {
 955          $src = false;
 956  
 957          if ( $icon ) {
 958              $src = wp_mime_type_icon( $attachment_id );
 959  
 960              if ( $src ) {
 961                  /** This filter is documented in wp-includes/post.php */
 962                  $icon_dir = apply_filters( 'icon_dir', ABSPATH . WPINC . '/images/media' );
 963  
 964                  $src_file               = $icon_dir . '/' . wp_basename( $src );
 965                  list( $width, $height ) = wp_getimagesize( $src_file );
 966              }
 967          }
 968  
 969          if ( $src && $width && $height ) {
 970              $image = array( $src, $width, $height, false );
 971          }
 972      }
 973      /**
 974       * Filters the attachment image source result.
 975       *
 976       * @since 4.3.0
 977       *
 978       * @param array|false  $image         {
 979       *     Array of image data, or boolean false if no image is available.
 980       *
 981       *     @type string $0 Image source URL.
 982       *     @type int    $1 Image width in pixels.
 983       *     @type int    $2 Image height in pixels.
 984       *     @type bool   $3 Whether the image is a resized image.
 985       * }
 986       * @param int          $attachment_id Image attachment ID.
 987       * @param string|int[] $size          Requested image size. Can be any registered image size name, or
 988       *                                    an array of width and height values in pixels (in that order).
 989       * @param bool         $icon          Whether the image should be treated as an icon.
 990       */
 991      return apply_filters( 'wp_get_attachment_image_src', $image, $attachment_id, $size, $icon );
 992  }
 993  
 994  /**
 995   * Get an HTML img element representing an image attachment.
 996   *
 997   * While `$size` will accept an array, it is better to register a size with
 998   * add_image_size() so that a cropped version is generated. It's much more
 999   * efficient than having to find the closest-sized image and then having the
1000   * browser scale down the image.
1001   *
1002   * @since 2.5.0
1003   * @since 4.4.0 The `$srcset` and `$sizes` attributes were added.
1004   * @since 5.5.0 The `$loading` attribute was added.
1005   *
1006   * @param int          $attachment_id Image attachment ID.
1007   * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array
1008   *                                    of width and height values in pixels (in that order). Default 'thumbnail'.
1009   * @param bool         $icon          Optional. Whether the image should be treated as an icon. Default false.
1010   * @param string|array $attr {
1011   *     Optional. Attributes for the image markup.
1012   *
1013   *     @type string       $src     Image attachment URL.
1014   *     @type string       $class   CSS class name or space-separated list of classes.
1015   *                                 Default `attachment-$size_class size-$size_class`,
1016   *                                 where `$size_class` is the image size being requested.
1017   *     @type string       $alt     Image description for the alt attribute.
1018   *     @type string       $srcset  The 'srcset' attribute value.
1019   *     @type string       $sizes   The 'sizes' attribute value.
1020   *     @type string|false $loading The 'loading' attribute value. Passing a value of false
1021   *                                 will result in the attribute being omitted for the image.
1022   *                                 Defaults to 'lazy', depending on wp_lazy_loading_enabled().
1023   * }
1024   * @return string HTML img element or empty string on failure.
1025   */
1026  function wp_get_attachment_image( $attachment_id, $size = 'thumbnail', $icon = false, $attr = '' ) {
1027      $html  = '';
1028      $image = wp_get_attachment_image_src( $attachment_id, $size, $icon );
1029  
1030      if ( $image ) {
1031          list( $src, $width, $height ) = $image;
1032  
1033          $attachment = get_post( $attachment_id );
1034          $hwstring   = image_hwstring( $width, $height );
1035          $size_class = $size;
1036  
1037          if ( is_array( $size_class ) ) {
1038              $size_class = implode( 'x', $size_class );
1039          }
1040  
1041          $default_attr = array(
1042              'src'   => $src,
1043              'class' => "attachment-$size_class size-$size_class",
1044              'alt'   => trim( strip_tags( get_post_meta( $attachment_id, '_wp_attachment_image_alt', true ) ) ),
1045          );
1046  
1047          // Add `loading` attribute.
1048          if ( wp_lazy_loading_enabled( 'img', 'wp_get_attachment_image' ) ) {
1049              $default_attr['loading'] = 'lazy';
1050          }
1051  
1052          $attr = wp_parse_args( $attr, $default_attr );
1053  
1054          // If the default value of `lazy` for the `loading` attribute is overridden
1055          // to omit the attribute for this image, ensure it is not included.
1056          if ( array_key_exists( 'loading', $attr ) && ! $attr['loading'] ) {
1057              unset( $attr['loading'] );
1058          }
1059  
1060          // Generate 'srcset' and 'sizes' if not already present.
1061          if ( empty( $attr['srcset'] ) ) {
1062              $image_meta = wp_get_attachment_metadata( $attachment_id );
1063  
1064              if ( is_array( $image_meta ) ) {
1065                  $size_array = array( absint( $width ), absint( $height ) );
1066                  $srcset     = wp_calculate_image_srcset( $size_array, $src, $image_meta, $attachment_id );
1067                  $sizes      = wp_calculate_image_sizes( $size_array, $src, $image_meta, $attachment_id );
1068  
1069                  if ( $srcset && ( $sizes || ! empty( $attr['sizes'] ) ) ) {
1070                      $attr['srcset'] = $srcset;
1071  
1072                      if ( empty( $attr['sizes'] ) ) {
1073                          $attr['sizes'] = $sizes;
1074                      }
1075                  }
1076              }
1077          }
1078  
1079          /**
1080           * Filters the list of attachment image attributes.
1081           *
1082           * @since 2.8.0
1083           *
1084           * @param string[]     $attr       Array of attribute values for the image markup, keyed by attribute name.
1085           *                                 See wp_get_attachment_image().
1086           * @param WP_Post      $attachment Image attachment post.
1087           * @param string|int[] $size       Requested image size. Can be any registered image size name, or
1088           *                                 an array of width and height values in pixels (in that order).
1089           */
1090          $attr = apply_filters( 'wp_get_attachment_image_attributes', $attr, $attachment, $size );
1091  
1092          $attr = array_map( 'esc_attr', $attr );
1093          $html = rtrim( "<img $hwstring" );
1094  
1095          foreach ( $attr as $name => $value ) {
1096              $html .= " $name=" . '"' . $value . '"';
1097          }
1098  
1099          $html .= ' />';
1100      }
1101  
1102      /**
1103       * HTML img element representing an image attachment.
1104       *
1105       * @since 5.6.0
1106       *
1107       * @param string       $html          HTML img element or empty string on failure.
1108       * @param int          $attachment_id Image attachment ID.
1109       * @param string|int[] $size          Requested image size. Can be any registered image size name, or
1110       *                                    an array of width and height values in pixels (in that order).
1111       * @param bool         $icon          Whether the image should be treated as an icon.
1112       * @param string[]     $attr          Array of attribute values for the image markup, keyed by attribute name.
1113       *                                    See wp_get_attachment_image().
1114       */
1115      return apply_filters( 'wp_get_attachment_image', $html, $attachment_id, $size, $icon, $attr );
1116  }
1117  
1118  /**
1119   * Get the URL of an image attachment.
1120   *
1121   * @since 4.4.0
1122   *
1123   * @param int          $attachment_id Image attachment ID.
1124   * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array of
1125   *                                    width and height values in pixels (in that order). Default 'thumbnail'.
1126   * @param bool         $icon          Optional. Whether the image should be treated as an icon. Default false.
1127   * @return string|false Attachment URL or false if no image is available. If `$size` does not match
1128   *                      any registered image size, the original image URL will be returned.
1129   */
1130  function wp_get_attachment_image_url( $attachment_id, $size = 'thumbnail', $icon = false ) {
1131      $image = wp_get_attachment_image_src( $attachment_id, $size, $icon );
1132      return isset( $image['0'] ) ? $image['0'] : false;
1133  }
1134  
1135  /**
1136   * Get the attachment path relative to the upload directory.
1137   *
1138   * @since 4.4.1
1139   * @access private
1140   *
1141   * @param string $file Attachment file name.
1142   * @return string Attachment path relative to the upload directory.
1143   */
1144  function _wp_get_attachment_relative_path( $file ) {
1145      $dirname = dirname( $file );
1146  
1147      if ( '.' === $dirname ) {
1148          return '';
1149      }
1150  
1151      if ( false !== strpos( $dirname, 'wp-content/uploads' ) ) {
1152          // Get the directory name relative to the upload directory (back compat for pre-2.7 uploads).
1153          $dirname = substr( $dirname, strpos( $dirname, 'wp-content/uploads' ) + 18 );
1154          $dirname = ltrim( $dirname, '/' );
1155      }
1156  
1157      return $dirname;
1158  }
1159  
1160  /**
1161   * Get the image size as array from its meta data.
1162   *
1163   * Used for responsive images.
1164   *
1165   * @since 4.4.0
1166   * @access private
1167   *
1168   * @param string $size_name  Image size. Accepts any registered image size name.
1169   * @param array  $image_meta The image meta data.
1170   * @return array|false {
1171   *     Array of width and height or false if the size isn't present in the meta data.
1172   *
1173   *     @type int $0 Image width.
1174   *     @type int $1 Image height.
1175   * }
1176   */
1177  function _wp_get_image_size_from_meta( $size_name, $image_meta ) {
1178      if ( 'full' === $size_name ) {
1179          return array(
1180              absint( $image_meta['width'] ),
1181              absint( $image_meta['height'] ),
1182          );
1183      } elseif ( ! empty( $image_meta['sizes'][ $size_name ] ) ) {
1184          return array(
1185              absint( $image_meta['sizes'][ $size_name ]['width'] ),
1186              absint( $image_meta['sizes'][ $size_name ]['height'] ),
1187          );
1188      }
1189  
1190      return false;
1191  }
1192  
1193  /**
1194   * Retrieves the value for an image attachment's 'srcset' attribute.
1195   *
1196   * @since 4.4.0
1197   *
1198   * @see wp_calculate_image_srcset()
1199   *
1200   * @param int          $attachment_id Image attachment ID.
1201   * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array of
1202   *                                    width and height values in pixels (in that order). Default 'medium'.
1203   * @param array        $image_meta    Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
1204   *                                    Default null.
1205   * @return string|false A 'srcset' value string or false.
1206   */
1207  function wp_get_attachment_image_srcset( $attachment_id, $size = 'medium', $image_meta = null ) {
1208      $image = wp_get_attachment_image_src( $attachment_id, $size );
1209  
1210      if ( ! $image ) {
1211          return false;
1212      }
1213  
1214      if ( ! is_array( $image_meta ) ) {
1215          $image_meta = wp_get_attachment_metadata( $attachment_id );
1216      }
1217  
1218      $image_src  = $image[0];
1219      $size_array = array(
1220          absint( $image[1] ),
1221          absint( $image[2] ),
1222      );
1223  
1224      return wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );
1225  }
1226  
1227  /**
1228   * A helper function to calculate the image sources to include in a 'srcset' attribute.
1229   *
1230   * @since 4.4.0
1231   *
1232   * @param int[]  $size_array    {
1233   *     An array of width and height values.
1234   *
1235   *     @type int $0 The width in pixels.
1236   *     @type int $1 The height in pixels.
1237   * }
1238   * @param string $image_src     The 'src' of the image.
1239   * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
1240   * @param int    $attachment_id Optional. The image attachment ID. Default 0.
1241   * @return string|false The 'srcset' attribute value. False on error or when only one source exists.
1242   */
1243  function wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id = 0 ) {
1244      /**
1245       * Let plugins pre-filter the image meta to be able to fix inconsistencies in the stored data.
1246       *
1247       * @since 4.5.0
1248       *
1249       * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
1250       * @param int[]  $size_array    {
1251       *     An array of requested width and height values.
1252       *
1253       *     @type int $0 The width in pixels.
1254       *     @type int $1 The height in pixels.
1255       * }
1256       * @param string $image_src     The 'src' of the image.
1257       * @param int    $attachment_id The image attachment ID or 0 if not supplied.
1258       */
1259      $image_meta = apply_filters( 'wp_calculate_image_srcset_meta', $image_meta, $size_array, $image_src, $attachment_id );
1260  
1261      if ( empty( $image_meta['sizes'] ) || ! isset( $image_meta['file'] ) || strlen( $image_meta['file'] ) < 4 ) {
1262          return false;
1263      }
1264  
1265      $image_sizes = $image_meta['sizes'];
1266  
1267      // Get the width and height of the image.
1268      $image_width  = (int) $size_array[0];
1269      $image_height = (int) $size_array[1];
1270  
1271      // Bail early if error/no width.
1272      if ( $image_width < 1 ) {
1273          return false;
1274      }
1275  
1276      $image_basename = wp_basename( $image_meta['file'] );
1277  
1278      /*
1279       * WordPress flattens animated GIFs into one frame when generating intermediate sizes.
1280       * To avoid hiding animation in user content, if src is a full size GIF, a srcset attribute is not generated.
1281       * If src is an intermediate size GIF, the full size is excluded from srcset to keep a flattened GIF from becoming animated.
1282       */
1283      if ( ! isset( $image_sizes['thumbnail']['mime-type'] ) || 'image/gif' !== $image_sizes['thumbnail']['mime-type'] ) {
1284          $image_sizes[] = array(
1285              'width'  => $image_meta['width'],
1286              'height' => $image_meta['height'],
1287              'file'   => $image_basename,
1288          );
1289      } elseif ( strpos( $image_src, $image_meta['file'] ) ) {
1290          return false;
1291      }
1292  
1293      // Retrieve the uploads sub-directory from the full size image.
1294      $dirname = _wp_get_attachment_relative_path( $image_meta['file'] );
1295  
1296      if ( $dirname ) {
1297          $dirname = trailingslashit( $dirname );
1298      }
1299  
1300      $upload_dir    = wp_get_upload_dir();
1301      $image_baseurl = trailingslashit( $upload_dir['baseurl'] ) . $dirname;
1302  
1303      /*
1304       * If currently on HTTPS, prefer HTTPS URLs when we know they're supported by the domain
1305       * (which is to say, when they share the domain name of the current request).
1306       */
1307      if ( is_ssl() && 'https' !== substr( $image_baseurl, 0, 5 ) && parse_url( $image_baseurl, PHP_URL_HOST ) === $_SERVER['HTTP_HOST'] ) {
1308          $image_baseurl = set_url_scheme( $image_baseurl, 'https' );
1309      }
1310  
1311      /*
1312       * Images that have been edited in WordPress after being uploaded will
1313       * contain a unique hash. Look for that hash and use it later to filter
1314       * out images that are leftovers from previous versions.
1315       */
1316      $image_edited = preg_match( '/-e[0-9]{13}/', wp_basename( $image_src ), $image_edit_hash );
1317  
1318      /**
1319       * Filters the maximum image width to be included in a 'srcset' attribute.
1320       *
1321       * @since 4.4.0
1322       *
1323       * @param int   $max_width  The maximum image width to be included in the 'srcset'. Default '2048'.
1324       * @param int[] $size_array {
1325       *     An array of requested width and height values.
1326       *
1327       *     @type int $0 The width in pixels.
1328       *     @type int $1 The height in pixels.
1329       * }
1330       */
1331      $max_srcset_image_width = apply_filters( 'max_srcset_image_width', 2048, $size_array );
1332  
1333      // Array to hold URL candidates.
1334      $sources = array();
1335  
1336      /**
1337       * To make sure the ID matches our image src, we will check to see if any sizes in our attachment
1338       * meta match our $image_src. If no matches are found we don't return a srcset to avoid serving
1339       * an incorrect image. See #35045.
1340       */
1341      $src_matched = false;
1342  
1343      /*
1344       * Loop through available images. Only use images that are resized
1345       * versions of the same edit.
1346       */
1347      foreach ( $image_sizes as $image ) {
1348          $is_src = false;
1349  
1350          // Check if image meta isn't corrupted.
1351          if ( ! is_array( $image ) ) {
1352              continue;
1353          }
1354  
1355          // If the file name is part of the `src`, we've confirmed a match.
1356          if ( ! $src_matched && false !== strpos( $image_src, $dirname . $image['file'] ) ) {
1357              $src_matched = true;
1358              $is_src      = true;
1359          }
1360  
1361          // Filter out images that are from previous edits.
1362          if ( $image_edited && ! strpos( $image['file'], $image_edit_hash[0] ) ) {
1363              continue;
1364          }
1365  
1366          /*
1367           * Filters out images that are wider than '$max_srcset_image_width' unless
1368           * that file is in the 'src' attribute.
1369           */
1370          if ( $max_srcset_image_width && $image['width'] > $max_srcset_image_width && ! $is_src ) {
1371              continue;
1372          }
1373  
1374          // If the image dimensions are within 1px of the expected size, use it.
1375          if ( wp_image_matches_ratio( $image_width, $image_height, $image['width'], $image['height'] ) ) {
1376              // Add the URL, descriptor, and value to the sources array to be returned.
1377              $source = array(
1378                  'url'        => $image_baseurl . $image['file'],
1379                  'descriptor' => 'w',
1380                  'value'      => $image['width'],
1381              );
1382  
1383              // The 'src' image has to be the first in the 'srcset', because of a bug in iOS8. See #35030.
1384              if ( $is_src ) {
1385                  $sources = array( $image['width'] => $source ) + $sources;
1386              } else {
1387                  $sources[ $image['width'] ] = $source;
1388              }
1389          }
1390      }
1391  
1392      /**
1393       * Filters an image's 'srcset' sources.
1394       *
1395       * @since 4.4.0
1396       *
1397       * @param array  $sources {
1398       *     One or more arrays of source data to include in the 'srcset'.
1399       *
1400       *     @type array $width {
1401       *         @type string $url        The URL of an image source.
1402       *         @type string $descriptor The descriptor type used in the image candidate string,
1403       *                                  either 'w' or 'x'.
1404       *         @type int    $value      The source width if paired with a 'w' descriptor, or a
1405       *                                  pixel density value if paired with an 'x' descriptor.
1406       *     }
1407       * }
1408       * @param array $size_array     {
1409       *     An array of requested width and height values.
1410       *
1411       *     @type int $0 The width in pixels.
1412       *     @type int $1 The height in pixels.
1413       * }
1414       * @param string $image_src     The 'src' of the image.
1415       * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
1416       * @param int    $attachment_id Image attachment ID or 0.
1417       */
1418      $sources = apply_filters( 'wp_calculate_image_srcset', $sources, $size_array, $image_src, $image_meta, $attachment_id );
1419  
1420      // Only return a 'srcset' value if there is more than one source.
1421      if ( ! $src_matched || ! is_array( $sources ) || count( $sources ) < 2 ) {
1422          return false;
1423      }
1424  
1425      $srcset = '';
1426  
1427      foreach ( $sources as $source ) {
1428          $srcset .= str_replace( ' ', '%20', $source['url'] ) . ' ' . $source['value'] . $source['descriptor'] . ', ';
1429      }
1430  
1431      return rtrim( $srcset, ', ' );
1432  }
1433  
1434  /**
1435   * Retrieves the value for an image attachment's 'sizes' attribute.
1436   *
1437   * @since 4.4.0
1438   *
1439   * @see wp_calculate_image_sizes()
1440   *
1441   * @param int          $attachment_id Image attachment ID.
1442   * @param string|int[] $size          Optional. Image size. Accepts any registered image size name, or an array of
1443   *                                    width and height values in pixels (in that order). Default 'medium'.
1444   * @param array        $image_meta    Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
1445   *                                    Default null.
1446   * @return string|false A valid source size value for use in a 'sizes' attribute or false.
1447   */
1448  function wp_get_attachment_image_sizes( $attachment_id, $size = 'medium', $image_meta = null ) {
1449      $image = wp_get_attachment_image_src( $attachment_id, $size );
1450  
1451      if ( ! $image ) {
1452          return false;
1453      }
1454  
1455      if ( ! is_array( $image_meta ) ) {
1456          $image_meta = wp_get_attachment_metadata( $attachment_id );
1457      }
1458  
1459      $image_src  = $image[0];
1460      $size_array = array(
1461          absint( $image[1] ),
1462          absint( $image[2] ),
1463      );
1464  
1465      return wp_calculate_image_sizes( $size_array, $image_src, $image_meta, $attachment_id );
1466  }
1467  
1468  /**
1469   * Creates a 'sizes' attribute value for an image.
1470   *
1471   * @since 4.4.0
1472   *
1473   * @param string|int[] $size          Image size. Accepts any registered image size name, or an array of
1474   *                                    width and height values in pixels (in that order).
1475   * @param string       $image_src     Optional. The URL to the image file. Default null.
1476   * @param array        $image_meta    Optional. The image meta data as returned by 'wp_get_attachment_metadata()'.
1477   *                                    Default null.
1478   * @param int          $attachment_id Optional. Image attachment ID. Either `$image_meta` or `$attachment_id`
1479   *                                    is needed when using the image size name as argument for `$size`. Default 0.
1480   * @return string|false A valid source size value for use in a 'sizes' attribute or false.
1481   */
1482  function wp_calculate_image_sizes( $size, $image_src = null, $image_meta = null, $attachment_id = 0 ) {
1483      $width = 0;
1484  
1485      if ( is_array( $size ) ) {
1486          $width = absint( $size[0] );
1487      } elseif ( is_string( $size ) ) {
1488          if ( ! $image_meta && $attachment_id ) {
1489              $image_meta = wp_get_attachment_metadata( $attachment_id );
1490          }
1491  
1492          if ( is_array( $image_meta ) ) {
1493              $size_array = _wp_get_image_size_from_meta( $size, $image_meta );
1494              if ( $size_array ) {
1495                  $width = absint( $size_array[0] );
1496              }
1497          }
1498      }
1499  
1500      if ( ! $width ) {
1501          return false;
1502      }
1503  
1504      // Setup the default 'sizes' attribute.
1505      $sizes = sprintf( '(max-width: %1$dpx) 100vw, %1$dpx', $width );
1506  
1507      /**
1508       * Filters the output of 'wp_calculate_image_sizes()'.
1509       *
1510       * @since 4.4.0
1511       *
1512       * @param string       $sizes         A source size value for use in a 'sizes' attribute.
1513       * @param string|int[] $size          Requested image size. Can be any registered image size name, or
1514       *                                    an array of width and height values in pixels (in that order).
1515       * @param string|null  $image_src     The URL to the image file or null.
1516       * @param array|null   $image_meta    The image meta data as returned by wp_get_attachment_metadata() or null.
1517       * @param int          $attachment_id Image attachment ID of the original image or 0.
1518       */
1519      return apply_filters( 'wp_calculate_image_sizes', $sizes, $size, $image_src, $image_meta, $attachment_id );
1520  }
1521  
1522  /**
1523   * Determines if the image meta data is for the image source file.
1524   *
1525   * The image meta data is retrieved by attachment post ID. In some cases the post IDs may change.
1526   * For example when the website is exported and imported at another website. Then the
1527   * attachment post IDs that are in post_content for the exported website may not match
1528   * the same attachments at the new website.
1529   *
1530   * @since 5.5.0
1531   *
1532   * @param string $image_location The full path or URI to the image file.
1533   * @param array  $image_meta     The attachment meta data as returned by 'wp_get_attachment_metadata()'.
1534   * @param int    $attachment_id  Optional. The image attachment ID. Default 0.
1535   * @return bool Whether the image meta is for this image file.
1536   */
1537  function wp_image_file_matches_image_meta( $image_location, $image_meta, $attachment_id = 0 ) {
1538      $match = false;
1539  
1540      // Ensure the $image_meta is valid.
1541      if ( isset( $image_meta['file'] ) && strlen( $image_meta['file'] ) > 4 ) {
1542          // Remove quiery args if image URI.
1543          list( $image_location ) = explode( '?', $image_location );
1544  
1545          // Check if the relative image path from the image meta is at the end of $image_location.
1546          if ( strrpos( $image_location, $image_meta['file'] ) === strlen( $image_location ) - strlen( $image_meta['file'] ) ) {
1547              $match = true;
1548          } else {
1549              // Retrieve the uploads sub-directory from the full size image.
1550              $dirname = _wp_get_attachment_relative_path( $image_meta['file'] );
1551  
1552              if ( $dirname ) {
1553                  $dirname = trailingslashit( $dirname );
1554              }
1555  
1556              if ( ! empty( $image_meta['original_image'] ) ) {
1557                  $relative_path = $dirname . $image_meta['original_image'];
1558  
1559                  if ( strrpos( $image_location, $relative_path ) === strlen( $image_location ) - strlen( $relative_path ) ) {
1560                      $match = true;
1561                  }
1562              }
1563  
1564              if ( ! $match && ! empty( $image_meta['sizes'] ) ) {
1565                  foreach ( $image_meta['sizes'] as $image_size_data ) {
1566                      $relative_path = $dirname . $image_size_data['file'];
1567  
1568                      if ( strrpos( $image_location, $relative_path ) === strlen( $image_location ) - strlen( $relative_path ) ) {
1569                          $match = true;
1570                          break;
1571                      }
1572                  }
1573              }
1574          }
1575      }
1576  
1577      /**
1578       * Filters whether an image path or URI matches image meta.
1579       *
1580       * @since 5.5.0
1581       *
1582       * @param bool   $match          Whether the image relative path from the image meta
1583       *                               matches the end of the URI or path to the image file.
1584       * @param string $image_location Full path or URI to the tested image file.
1585       * @param array  $image_meta     The image meta data as returned by 'wp_get_attachment_metadata()'.
1586       * @param int    $attachment_id  The image attachment ID or 0 if not supplied.
1587       */
1588      return apply_filters( 'wp_image_file_matches_image_meta', $match, $image_location, $image_meta, $attachment_id );
1589  }
1590  
1591  /**
1592   * Determines an image's width and height dimensions based on the source file.
1593   *
1594   * @since 5.5.0
1595   *
1596   * @param string $image_src     The image source file.
1597   * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
1598   * @param int    $attachment_id Optional. The image attachment ID. Default 0.
1599   * @return array|false Array with first element being the width and second element being the height,
1600   *                     or false if dimensions cannot be determined.
1601   */
1602  function wp_image_src_get_dimensions( $image_src, $image_meta, $attachment_id = 0 ) {
1603      $dimensions = false;
1604  
1605      // Is it a full size image?
1606      if (
1607          isset( $image_meta['file'] ) &&
1608          strpos( $image_src, wp_basename( $image_meta['file'] ) ) !== false
1609      ) {
1610          $dimensions = array(
1611              (int) $image_meta['width'],
1612              (int) $image_meta['height'],
1613          );
1614      }
1615  
1616      if ( ! $dimensions && ! empty( $image_meta['sizes'] ) ) {
1617          $src_filename = wp_basename( $image_src );
1618  
1619          foreach ( $image_meta['sizes'] as $image_size_data ) {
1620              if ( $src_filename === $image_size_data['file'] ) {
1621                  $dimensions = array(
1622                      (int) $image_size_data['width'],
1623                      (int) $image_size_data['height'],
1624                  );
1625  
1626                  break;
1627              }
1628          }
1629      }
1630  
1631      /**
1632       * Filters the 'wp_image_src_get_dimensions' value.
1633       *
1634       * @since 5.7.0
1635       *
1636       * @param array|false $dimensions    Array with first element being the width
1637       *                                   and second element being the height, or
1638       *                                   false if dimensions could not be determined.
1639       * @param string      $image_src     The image source file.
1640       * @param array       $image_meta    The image meta data as returned by
1641       *                                   'wp_get_attachment_metadata()'.
1642       * @param int         $attachment_id The image attachment ID. Default 0.
1643       */
1644      return apply_filters( 'wp_image_src_get_dimensions', $dimensions, $image_src, $image_meta, $attachment_id );
1645  }
1646  
1647  /**
1648   * Adds 'srcset' and 'sizes' attributes to an existing 'img' element.
1649   *
1650   * @since 4.4.0
1651   *
1652   * @see wp_calculate_image_srcset()
1653   * @see wp_calculate_image_sizes()
1654   *
1655   * @param string $image         An HTML 'img' element to be filtered.
1656   * @param array  $image_meta    The image meta data as returned by 'wp_get_attachment_metadata()'.
1657   * @param int    $attachment_id Image attachment ID.
1658   * @return string Converted 'img' element with 'srcset' and 'sizes' attributes added.
1659   */
1660  function wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id ) {
1661      // Ensure the image meta exists.
1662      if ( empty( $image_meta['sizes'] ) ) {
1663          return $image;
1664      }
1665  
1666      $image_src         = preg_match( '/src="([^"]+)"/', $image, $match_src ) ? $match_src[1] : '';
1667      list( $image_src ) = explode( '?', $image_src );
1668  
1669      // Return early if we couldn't get the image source.
1670      if ( ! $image_src ) {
1671          return $image;
1672      }
1673  
1674      // Bail early if an image has been inserted and later edited.
1675      if ( preg_match( '/-e[0-9]{13}/', $image_meta['file'], $img_edit_hash ) &&
1676          strpos( wp_basename( $image_src ), $img_edit_hash[0] ) === false ) {
1677  
1678          return $image;
1679      }
1680  
1681      $width  = preg_match( '/ width="([0-9]+)"/', $image, $match_width ) ? (int) $match_width[1] : 0;
1682      $height = preg_match( '/ height="([0-9]+)"/', $image, $match_height ) ? (int) $match_height[1] : 0;
1683  
1684      if ( $width && $height ) {
1685          $size_array = array( $width, $height );
1686      } else {
1687          $size_array = wp_image_src_get_dimensions( $image_src, $image_meta, $attachment_id );
1688          if ( ! $size_array ) {
1689              return $image;
1690          }
1691      }
1692  
1693      $srcset = wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );
1694  
1695      if ( $srcset ) {
1696          // Check if there is already a 'sizes' attribute.
1697          $sizes = strpos( $image, ' sizes=' );
1698  
1699          if ( ! $sizes ) {
1700              $sizes = wp_calculate_image_sizes( $size_array, $image_src, $image_meta, $attachment_id );
1701          }
1702      }
1703  
1704      if ( $srcset && $sizes ) {
1705          // Format the 'srcset' and 'sizes' string and escape attributes.
1706          $attr = sprintf( ' srcset="%s"', esc_attr( $srcset ) );
1707  
1708          if ( is_string( $sizes ) ) {
1709              $attr .= sprintf( ' sizes="%s"', esc_attr( $sizes ) );
1710          }
1711  
1712          // Add the srcset and sizes attributes to the image markup.
1713          return preg_replace( '/<img ([^>]+?)[\/ ]*>/', '<img $1' . $attr . ' />', $image );
1714      }
1715  
1716      return $image;
1717  }
1718  
1719  /**
1720   * Determines whether to add the `loading` attribute to the specified tag in the specified context.
1721   *
1722   * @since 5.5.0
1723   * @since 5.7.0 Now returns `true` by default for `iframe` tags.
1724   *
1725   * @param string $tag_name The tag name.
1726   * @param string $context  Additional context, like the current filter name
1727   *                         or the function name from where this was called.
1728   * @return bool Whether to add the attribute.
1729   */
1730  function wp_lazy_loading_enabled( $tag_name, $context ) {
1731      // By default add to all 'img' and 'iframe' tags.
1732      // See https://html.spec.whatwg.org/multipage/embedded-content.html#attr-img-loading
1733      // See https://html.spec.whatwg.org/multipage/iframe-embed-object.html#attr-iframe-loading
1734      $default = ( 'img' === $tag_name || 'iframe' === $tag_name );
1735  
1736      /**
1737       * Filters whether to add the `loading` attribute to the specified tag in the specified context.
1738       *
1739       * @since 5.5.0
1740       *
1741       * @param bool   $default  Default value.
1742       * @param string $tag_name The tag name.
1743       * @param string $context  Additional context, like the current filter name
1744       *                         or the function name from where this was called.
1745       */
1746      return (bool) apply_filters( 'wp_lazy_loading_enabled', $default, $tag_name, $context );
1747  }
1748  
1749  /**
1750   * Filters specific tags in post content and modifies their markup.
1751   *
1752   * Modifies HTML tags in post content to include new browser and HTML technologies
1753   * that may not have existed at the time of post creation. These modifications currently
1754   * include adding `srcset`, `sizes`, and `loading` attributes to `img` HTML tags, as well
1755   * as adding `loading` attributes to `iframe` HTML tags.
1756   * Future similar optimizations should be added/expected here.
1757   *
1758   * @since 5.5.0
1759   * @since 5.7.0 Now supports adding `loading` attributes to `iframe` tags.
1760   *
1761   * @see wp_img_tag_add_width_and_height_attr()
1762   * @see wp_img_tag_add_srcset_and_sizes_attr()
1763   * @see wp_img_tag_add_loading_attr()
1764   * @see wp_iframe_tag_add_loading_attr()
1765   *
1766   * @param string $content The HTML content to be filtered.
1767   * @param string $context Optional. Additional context to pass to the filters.
1768   *                        Defaults to `current_filter()` when not set.
1769   * @return string Converted content with images modified.
1770   */
1771  function wp_filter_content_tags( $content, $context = null ) {
1772      if ( null === $context ) {
1773          $context = current_filter();
1774      }
1775  
1776      $add_img_loading_attr    = wp_lazy_loading_enabled( 'img', $context );
1777      $add_iframe_loading_attr = wp_lazy_loading_enabled( 'iframe', $context );
1778  
1779      if ( ! preg_match_all( '/<(img|iframe)\s[^>]+>/', $content, $matches, PREG_SET_ORDER ) ) {
1780          return $content;
1781      }
1782  
1783      // List of the unique `img` tags found in $content.
1784      $images = array();
1785  
1786      // List of the unique `iframe` tags found in $content.
1787      $iframes = array();
1788  
1789      foreach ( $matches as $match ) {
1790          list( $tag, $tag_name ) = $match;
1791  
1792          switch ( $tag_name ) {
1793              case 'img':
1794                  if ( preg_match( '/wp-image-([0-9]+)/i', $tag, $class_id ) ) {
1795                      $attachment_id = absint( $class_id[1] );
1796  
1797                      if ( $attachment_id ) {
1798                          // If exactly the same image tag is used more than once, overwrite it.
1799                          // All identical tags will be replaced later with 'str_replace()'.
1800                          $images[ $tag ] = $attachment_id;
1801                          break;
1802                      }
1803                  }
1804                  $images[ $tag ] = 0;
1805                  break;
1806              case 'iframe':
1807                  $iframes[ $tag ] = 0;
1808                  break;
1809          }
1810      }
1811  
1812      // Reduce the array to unique attachment IDs.
1813      $attachment_ids = array_unique( array_filter( array_values( $images ) ) );
1814  
1815      if ( count( $attachment_ids ) > 1 ) {
1816          /*
1817           * Warm the object cache with post and meta information for all found
1818           * images to avoid making individual database calls.
1819           */
1820          _prime_post_caches( $attachment_ids, false, true );
1821      }
1822  
1823      foreach ( $images as $image => $attachment_id ) {
1824          $filtered_image = $image;
1825  
1826          // Add 'width' and 'height' attributes if applicable.
1827          if ( $attachment_id > 0 && false === strpos( $filtered_image, ' width=' ) && false === strpos( $filtered_image, ' height=' ) ) {
1828              $filtered_image = wp_img_tag_add_width_and_height_attr( $filtered_image, $context, $attachment_id );
1829          }
1830  
1831          // Add 'srcset' and 'sizes' attributes if applicable.
1832          if ( $attachment_id > 0 && false === strpos( $filtered_image, ' srcset=' ) ) {
1833              $filtered_image = wp_img_tag_add_srcset_and_sizes_attr( $filtered_image, $context, $attachment_id );
1834          }
1835  
1836          // Add 'loading' attribute if applicable.
1837          if ( $add_img_loading_attr && false === strpos( $filtered_image, ' loading=' ) ) {
1838              $filtered_image = wp_img_tag_add_loading_attr( $filtered_image, $context );
1839          }
1840  
1841          if ( $filtered_image !== $image ) {
1842              $content = str_replace( $image, $filtered_image, $content );
1843          }
1844      }
1845  
1846      foreach ( $iframes as $iframe => $attachment_id ) {
1847          $filtered_iframe = $iframe;
1848  
1849          // Add 'loading' attribute if applicable.
1850          if ( $add_iframe_loading_attr && false === strpos( $filtered_iframe, ' loading=' ) ) {
1851              $filtered_iframe = wp_iframe_tag_add_loading_attr( $filtered_iframe, $context );
1852          }
1853  
1854          if ( $filtered_iframe !== $iframe ) {
1855              $content = str_replace( $iframe, $filtered_iframe, $content );
1856          }
1857      }
1858  
1859      return $content;
1860  }
1861  
1862  /**
1863   * Adds `loading` attribute to an `img` HTML tag.
1864   *
1865   * @since 5.5.0
1866   *
1867   * @param string $image   The HTML `img` tag where the attribute should be added.
1868   * @param string $context Additional context to pass to the filters.
1869   * @return string Converted `img` tag with `loading` attribute added.
1870   */
1871  function wp_img_tag_add_loading_attr( $image, $context ) {
1872      // Images should have source and dimension attributes for the `loading` attribute to be added.
1873      if ( false === strpos( $image, ' src="' ) || false === strpos( $image, ' width="' ) || false === strpos( $image, ' height="' ) ) {
1874          return $image;
1875      }
1876  
1877      /**
1878       * Filters the `loading` attribute value to add to an image. Default `lazy`.
1879       *
1880       * Returning `false` or an empty string will not add the attribute.
1881       * Returning `true` will add the default value.
1882       *
1883       * @since 5.5.0
1884       *
1885       * @param string|bool $value   The `loading` attribute value. Returning a falsey value will result in
1886       *                             the attribute being omitted for the image. Default 'lazy'.
1887       * @param string      $image   The HTML `img` tag to be filtered.
1888       * @param string      $context Additional context about how the function was called or where the img tag is.
1889       */
1890      $value = apply_filters( 'wp_img_tag_add_loading_attr', 'lazy', $image, $context );
1891  
1892      if ( $value ) {
1893          if ( ! in_array( $value, array( 'lazy', 'eager' ), true ) ) {
1894              $value = 'lazy';
1895          }
1896  
1897          return str_replace( '<img', '<img loading="' . esc_attr( $value ) . '"', $image );
1898      }
1899  
1900      return $image;
1901  }
1902  
1903  /**
1904   * Adds `width` and `height` attributes to an `img` HTML tag.
1905   *
1906   * @since 5.5.0
1907   *
1908   * @param string $image         The HTML `img` tag where the attribute should be added.
1909   * @param string $context       Additional context to pass to the filters.
1910   * @param int    $attachment_id Image attachment ID.
1911   * @return string Converted 'img' element with 'width' and 'height' attributes added.
1912   */
1913  function wp_img_tag_add_width_and_height_attr( $image, $context, $attachment_id ) {
1914      $image_src         = preg_match( '/src="([^"]+)"/', $image, $match_src ) ? $match_src[1] : '';
1915      list( $image_src ) = explode( '?', $image_src );
1916  
1917      // Return early if we couldn't get the image source.
1918      if ( ! $image_src ) {
1919          return $image;
1920      }
1921  
1922      /**
1923       * Filters whether to add the missing `width` and `height` HTML attributes to the img tag. Default `true`.
1924       *
1925       * Returning anything else than `true` will not add the attributes.
1926       *
1927       * @since 5.5.0
1928       *
1929       * @param bool   $value         The filtered value, defaults to `true`.
1930       * @param string $image         The HTML `img` tag where the attribute should be added.
1931       * @param string $context       Additional context about how the function was called or where the img tag is.
1932       * @param int    $attachment_id The image attachment ID.
1933       */
1934      $add = apply_filters( 'wp_img_tag_add_width_and_height_attr', true, $image, $context, $attachment_id );
1935  
1936      if ( true === $add ) {
1937          $image_meta = wp_get_attachment_metadata( $attachment_id );
1938          $size_array = wp_image_src_get_dimensions( $image_src, $image_meta, $attachment_id );
1939  
1940          if ( $size_array ) {
1941              $hw = trim( image_hwstring( $size_array[0], $size_array[1] ) );
1942              return str_replace( '<img', "<img {$hw}", $image );
1943          }
1944      }
1945  
1946      return $image;
1947  }
1948  
1949  /**
1950   * Adds `srcset` and `sizes` attributes to an existing `img` HTML tag.
1951   *
1952   * @since 5.5.0
1953   *
1954   * @param string $image         The HTML `img` tag where the attribute should be added.
1955   * @param string $context       Additional context to pass to the filters.
1956   * @param int    $attachment_id Image attachment ID.
1957   * @return string Converted 'img' element with 'loading' attribute added.
1958   */
1959  function wp_img_tag_add_srcset_and_sizes_attr( $image, $context, $attachment_id ) {
1960      /**
1961       * Filters whether to add the `srcset` and `sizes` HTML attributes to the img tag. Default `true`.
1962       *
1963       * Returning anything else than `true` will not add the attributes.
1964       *
1965       * @since 5.5.0
1966       *
1967       * @param bool   $value         The filtered value, defaults to `true`.
1968       * @param string $image         The HTML `img` tag where the attribute should be added.
1969       * @param string $context       Additional context about how the function was called or where the img tag is.
1970       * @param int    $attachment_id The image attachment ID.
1971       */
1972      $add = apply_filters( 'wp_img_tag_add_srcset_and_sizes_attr', true, $image, $context, $attachment_id );
1973  
1974      if ( true === $add ) {
1975          $image_meta = wp_get_attachment_metadata( $attachment_id );
1976          return wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id );
1977      }
1978  
1979      return $image;
1980  }
1981  
1982  /**
1983   * Adds `loading` attribute to an `iframe` HTML tag.
1984   *
1985   * @since 5.7.0
1986   *
1987   * @param string $iframe  The HTML `iframe` tag where the attribute should be added.
1988   * @param string $context Additional context to pass to the filters.
1989   * @return string Converted `iframe` tag with `loading` attribute added.
1990   */
1991  function wp_iframe_tag_add_loading_attr( $iframe, $context ) {
1992      // Iframes with fallback content (see `wp_filter_oembed_result()`) should not be lazy-loaded because they are
1993      // visually hidden initially.
1994      if ( false !== strpos( $iframe, ' data-secret="' ) ) {
1995          return $iframe;
1996      }
1997  
1998      // Iframes should have source and dimension attributes for the `loading` attribute to be added.
1999      if ( false === strpos( $iframe, ' src="' ) || false === strpos( $iframe, ' width="' ) || false === strpos( $iframe, ' height="' ) ) {
2000          return $iframe;
2001      }
2002  
2003      /**
2004       * Filters the `loading` attribute value to add to an iframe. Default `lazy`.
2005       *
2006       * Returning `false` or an empty string will not add the attribute.
2007       * Returning `true` will add the default value.
2008       *
2009       * @since 5.7.0
2010       *
2011       * @param string|bool $value   The `loading` attribute value. Returning a falsey value will result in
2012       *                             the attribute being omitted for the iframe. Default 'lazy'.
2013       * @param string      $iframe  The HTML `iframe` tag to be filtered.
2014       * @param string      $context Additional context about how the function was called or where the iframe tag is.
2015       */
2016      $value = apply_filters( 'wp_iframe_tag_add_loading_attr', 'lazy', $iframe, $context );
2017  
2018      if ( $value ) {
2019          if ( ! in_array( $value, array( 'lazy', 'eager' ), true ) ) {
2020              $value = 'lazy';
2021          }
2022  
2023          return str_replace( '<iframe', '<iframe loading="' . esc_attr( $value ) . '"', $iframe );
2024      }
2025  
2026      return $iframe;
2027  }
2028  
2029  /**
2030   * Adds a 'wp-post-image' class to post thumbnails. Internal use only.
2031   *
2032   * Uses the {@see 'begin_fetch_post_thumbnail_html'} and {@see 'end_fetch_post_thumbnail_html'}
2033   * action hooks to dynamically add/remove itself so as to only filter post thumbnails.
2034   *
2035   * @ignore
2036   * @since 2.9.0
2037   *
2038   * @param string[] $attr Array of thumbnail attributes including src, class, alt, title, keyed by attribute name.
2039   * @return string[] Modified array of attributes including the new 'wp-post-image' class.
2040   */
2041  function _wp_post_thumbnail_class_filter( $attr ) {
2042      $attr['class'] .= ' wp-post-image';
2043      return $attr;
2044  }
2045  
2046  /**
2047   * Adds '_wp_post_thumbnail_class_filter' callback to the 'wp_get_attachment_image_attributes'
2048   * filter hook. Internal use only.
2049   *
2050   * @ignore
2051   * @since 2.9.0
2052   *
2053   * @param string[] $attr Array of thumbnail attributes including src, class, alt, title, keyed by attribute name.
2054   */
2055  function _wp_post_thumbnail_class_filter_add( $attr ) {
2056      add_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
2057  }
2058  
2059  /**
2060   * Removes the '_wp_post_thumbnail_class_filter' callback from the 'wp_get_attachment_image_attributes'
2061   * filter hook. Internal use only.
2062   *
2063   * @ignore
2064   * @since 2.9.0
2065   *
2066   * @param string[] $attr Array of thumbnail attributes including src, class, alt, title, keyed by attribute name.
2067   */
2068  function _wp_post_thumbnail_class_filter_remove( $attr ) {
2069      remove_filter( 'wp_get_attachment_image_attributes', '_wp_post_thumbnail_class_filter' );
2070  }
2071  
2072  add_shortcode( 'wp_caption', 'img_caption_shortcode' );
2073  add_shortcode( 'caption', 'img_caption_shortcode' );
2074  
2075  /**
2076   * Builds the Caption shortcode output.
2077   *
2078   * Allows a plugin to replace the content that would otherwise be returned. The
2079   * filter is {@see 'img_caption_shortcode'} and passes an empty string, the attr
2080   * parameter and the content parameter values.
2081   *
2082   * The supported attributes for the shortcode are 'id', 'caption_id', 'align',
2083   * 'width', 'caption', and 'class'.
2084   *
2085   * @since 2.6.0
2086   * @since 3.9.0 The `class` attribute was added.
2087   * @since 5.1.0 The `caption_id` attribute was added.
2088   *
2089   * @param array  $attr {
2090   *     Attributes of the caption shortcode.
2091   *
2092   *     @type string $id         ID of the image and caption container element, i.e. `<figure>` or `<div>`.
2093   *     @type string $caption_id ID of the caption element, i.e. `<figcaption>` or `<p>`.
2094   *     @type string $align      Class name that aligns the caption. Default 'alignnone'. Accepts 'alignleft',
2095   *                              'aligncenter', alignright', 'alignnone'.
2096   *     @type int    $width      The width of the caption, in pixels.
2097   *     @type string $caption    The caption text.
2098   *     @type string $class      Additional class name(s) added to the caption container.
2099   * }
2100   * @param string $content Shortcode content.
2101   * @return string HTML content to display the caption.
2102   */
2103  function img_caption_shortcode( $attr, $content = null ) {
2104      // New-style shortcode with the caption inside the shortcode with the link and image tags.
2105      if ( ! isset( $attr['caption'] ) ) {
2106          if ( preg_match( '#((?:<a [^>]+>\s*)?<img [^>]+>(?:\s*</a>)?)(.*)#is', $content, $matches ) ) {
2107              $content         = $matches[1];
2108              $attr['caption'] = trim( $matches[2] );
2109          }
2110      } elseif ( strpos( $attr['caption'], '<' ) !== false ) {
2111          $attr['caption'] = wp_kses( $attr['caption'], 'post' );
2112      }
2113  
2114      /**
2115       * Filters the default caption shortcode output.
2116       *
2117       * If the filtered output isn't empty, it will be used instead of generating
2118       * the default caption template.
2119       *
2120       * @since 2.6.0
2121       *
2122       * @see img_caption_shortcode()
2123       *
2124       * @param string $output  The caption output. Default empty.
2125       * @param array  $attr    Attributes of the caption shortcode.
2126       * @param string $content The image element, possibly wrapped in a hyperlink.
2127       */
2128      $output = apply_filters( 'img_caption_shortcode', '', $attr, $content );
2129  
2130      if ( ! empty( $output ) ) {
2131          return $output;
2132      }
2133  
2134      $atts = shortcode_atts(
2135          array(
2136              'id'         => '',
2137              'caption_id' => '',
2138              'align'      => 'alignnone',
2139              'width'      => '',
2140              'caption'    => '',
2141              'class'      => '',
2142          ),
2143          $attr,
2144          'caption'
2145      );
2146  
2147      $atts['width'] = (int) $atts['width'];
2148  
2149      if ( $atts['width'] < 1 || empty( $atts['caption'] ) ) {
2150          return $content;
2151      }
2152  
2153      $id          = '';
2154      $caption_id  = '';
2155      $describedby = '';
2156  
2157      if ( $atts['id'] ) {
2158          $atts['id'] = sanitize_html_class( $atts['id'] );
2159          $id         = 'id="' . esc_attr( $atts['id'] ) . '" ';
2160      }
2161  
2162      if ( $atts['caption_id'] ) {
2163          $atts['caption_id'] = sanitize_html_class( $atts['caption_id'] );
2164      } elseif ( $atts['id'] ) {
2165          $atts['caption_id'] = 'caption-' . str_replace( '_', '-', $atts['id'] );
2166      }
2167  
2168      if ( $atts['caption_id'] ) {
2169          $caption_id  = 'id="' . esc_attr( $atts['caption_id'] ) . '" ';
2170          $describedby = 'aria-describedby="' . esc_attr( $atts['caption_id'] ) . '" ';
2171      }
2172  
2173      $class = trim( 'wp-caption ' . $atts['align'] . ' ' . $atts['class'] );
2174  
2175      $html5 = current_theme_supports( 'html5', 'caption' );
2176      // HTML5 captions never added the extra 10px to the image width.
2177      $width = $html5 ? $atts['width'] : ( 10 + $atts['width'] );
2178  
2179      /**
2180       * Filters the width of an image's caption.
2181       *
2182       * By default, the caption is 10 pixels greater than the width of the image,
2183       * to prevent post content from running up against a floated image.
2184       *
2185       * @since 3.7.0
2186       *
2187       * @see img_caption_shortcode()
2188       *
2189       * @param int    $width    Width of the caption in pixels. To remove this inline style,
2190       *                         return zero.
2191       * @param array  $atts     Attributes of the caption shortcode.
2192       * @param string $content  The image element, possibly wrapped in a hyperlink.
2193       */
2194      $caption_width = apply_filters( 'img_caption_shortcode_width', $width, $atts, $content );
2195  
2196      $style = '';
2197  
2198      if ( $caption_width ) {
2199          $style = 'style="width: ' . (int) $caption_width . 'px" ';
2200      }
2201  
2202      if ( $html5 ) {
2203          $html = sprintf(
2204              '<figure %s%s%sclass="%s">%s%s</figure>',
2205              $id,
2206              $describedby,
2207              $style,
2208              esc_attr( $class ),
2209              do_shortcode( $content ),
2210              sprintf(
2211                  '<figcaption %sclass="wp-caption-text">%s</figcaption>',
2212                  $caption_id,
2213                  $atts['caption']
2214              )
2215          );
2216      } else {
2217          $html = sprintf(
2218              '<div %s%sclass="%s">%s%s</div>',
2219              $id,
2220              $style,
2221              esc_attr( $class ),
2222              str_replace( '<img ', '<img ' . $describedby, do_shortcode( $content ) ),
2223              sprintf(
2224                  '<p %sclass="wp-caption-text">%s</p>',
2225                  $caption_id,
2226                  $atts['caption']
2227              )
2228          );
2229      }
2230  
2231      return $html;
2232  }
2233  
2234  add_shortcode( 'gallery', 'gallery_shortcode' );
2235  
2236  /**
2237   * Builds the Gallery shortcode output.
2238   *
2239   * This implements the functionality of the Gallery Shortcode for displaying
2240   * WordPress images on a post.
2241   *
2242   * @since 2.5.0
2243   *
2244   * @param array $attr {
2245   *     Attributes of the gallery shortcode.
2246   *
2247   *     @type string       $order      Order of the images in the gallery. Default 'ASC'. Accepts 'ASC', 'DESC'.
2248   *     @type string       $orderby    The field to use when ordering the images. Default 'menu_order ID'.
2249   *                                    Accepts any valid SQL ORDERBY statement.
2250   *     @type int          $id         Post ID.
2251   *     @type string       $itemtag    HTML tag to use for each image in the gallery.
2252   *                                    Default 'dl', or 'figure' when the theme registers HTML5 gallery support.
2253   *     @type string       $icontag    HTML tag to use for each image's icon.
2254   *                                    Default 'dt', or 'div' when the theme registers HTML5 gallery support.
2255   *     @type string       $captiontag HTML tag to use for each image's caption.
2256   *                                    Default 'dd', or 'figcaption' when the theme registers HTML5 gallery support.
2257   *     @type int          $columns    Number of columns of images to display. Default 3.
2258   *     @type string|int[] $size       Size of the images to display. Accepts any registered image size name, or an array
2259   *                                    of width and height values in pixels (in that order). Default 'thumbnail'.
2260   *     @type string       $ids        A comma-separated list of IDs of attachments to display. Default empty.
2261   *     @type string       $include    A comma-separated list of IDs of attachments to include. Default empty.
2262   *     @type string       $exclude    A comma-separated list of IDs of attachments to exclude. Default empty.
2263   *     @type string       $link       What to link each image to. Default empty (links to the attachment page).
2264   *                                    Accepts 'file', 'none'.
2265   * }
2266   * @return string HTML content to display gallery.
2267   */
2268  function gallery_shortcode( $attr ) {
2269      $post = get_post();
2270  
2271      static $instance = 0;
2272      $instance++;
2273  
2274      if ( ! empty( $attr['ids'] ) ) {
2275          // 'ids' is explicitly ordered, unless you specify otherwise.
2276          if ( empty( $attr['orderby'] ) ) {
2277              $attr['orderby'] = 'post__in';
2278          }
2279          $attr['include'] = $attr['ids'];
2280      }
2281  
2282      /**
2283       * Filters the default gallery shortcode output.
2284       *
2285       * If the filtered output isn't empty, it will be used instead of generating
2286       * the default gallery template.
2287       *
2288       * @since 2.5.0
2289       * @since 4.2.0 The `$instance` parameter was added.
2290       *
2291       * @see gallery_shortcode()
2292       *
2293       * @param string $output   The gallery output. Default empty.
2294       * @param array  $attr     Attributes of the gallery shortcode.
2295       * @param int    $instance Unique numeric ID of this gallery shortcode instance.
2296       */
2297      $output = apply_filters( 'post_gallery', '', $attr, $instance );
2298  
2299      if ( ! empty( $output ) ) {
2300          return $output;
2301      }
2302  
2303      $html5 = current_theme_supports( 'html5', 'gallery' );
2304      $atts  = shortcode_atts(
2305          array(
2306              'order'      => 'ASC',
2307              'orderby'    => 'menu_order ID',
2308              'id'         => $post ? $post->ID : 0,
2309              'itemtag'    => $html5 ? 'figure' : 'dl',
2310              'icontag'    => $html5 ? 'div' : 'dt',
2311              'captiontag' => $html5 ? 'figcaption' : 'dd',
2312              'columns'    => 3,
2313              'size'       => 'thumbnail',
2314              'include'    => '',
2315              'exclude'    => '',
2316              'link'       => '',
2317          ),
2318          $attr,
2319          'gallery'
2320      );
2321  
2322      $id = (int) $atts['id'];
2323  
2324      if ( ! empty( $atts['include'] ) ) {
2325          $_attachments = get_posts(
2326              array(
2327                  'include'        => $atts['include'],
2328                  'post_status'    => 'inherit',
2329                  'post_type'      => 'attachment',
2330                  'post_mime_type' => 'image',
2331                  'order'          => $atts['order'],
2332                  'orderby'        => $atts['orderby'],
2333              )
2334          );
2335  
2336          $attachments = array();
2337          foreach ( $_attachments as $key => $val ) {
2338              $attachments[ $val->ID ] = $_attachments[ $key ];
2339          }
2340      } elseif ( ! empty( $atts['exclude'] ) ) {
2341          $attachments = get_children(
2342              array(
2343                  'post_parent'    => $id,
2344                  'exclude'        => $atts['exclude'],
2345                  'post_status'    => 'inherit',
2346                  'post_type'      => 'attachment',
2347                  'post_mime_type' => 'image',
2348                  'order'          => $atts['order'],
2349                  'orderby'        => $atts['orderby'],
2350              )
2351          );
2352      } else {
2353          $attachments = get_children(
2354              array(
2355                  'post_parent'    => $id,
2356                  'post_status'    => 'inherit',
2357                  'post_type'      => 'attachment',
2358                  'post_mime_type' => 'image',
2359                  'order'          => $atts['order'],
2360                  'orderby'        => $atts['orderby'],
2361              )
2362          );
2363      }
2364  
2365      if ( empty( $attachments ) ) {
2366          return '';
2367      }
2368  
2369      if ( is_feed() ) {
2370          $output = "\n";
2371          foreach ( $attachments as $att_id => $attachment ) {
2372              if ( ! empty( $atts['link'] ) ) {
2373                  if ( 'none' === $atts['link'] ) {
2374                      $output .= wp_get_attachment_image( $att_id, $atts['size'], false, $attr );
2375                  } else {
2376                      $output .= wp_get_attachment_link( $att_id, $atts['size'], false );
2377                  }
2378              } else {
2379                  $output .= wp_get_attachment_link( $att_id, $atts['size'], true );
2380              }
2381              $output .= "\n";
2382          }
2383          return $output;
2384      }
2385  
2386      $itemtag    = tag_escape( $atts['itemtag'] );
2387      $captiontag = tag_escape( $atts['captiontag'] );
2388      $icontag    = tag_escape( $atts['icontag'] );
2389      $valid_tags = wp_kses_allowed_html( 'post' );
2390      if ( ! isset( $valid_tags[ $itemtag ] ) ) {
2391          $itemtag = 'dl';
2392      }
2393      if ( ! isset( $valid_tags[ $captiontag ] ) ) {
2394          $captiontag = 'dd';
2395      }
2396      if ( ! isset( $valid_tags[ $icontag ] ) ) {
2397          $icontag = 'dt';
2398      }
2399  
2400      $columns   = (int) $atts['columns'];
2401      $itemwidth = $columns > 0 ? floor( 100 / $columns ) : 100;
2402      $float     = is_rtl() ? 'right' : 'left';
2403  
2404      $selector = "gallery-{$instance}";
2405  
2406      $gallery_style = '';
2407  
2408      /**
2409       * Filters whether to print default gallery styles.
2410       *
2411       * @since 3.1.0
2412       *
2413       * @param bool $print Whether to print default gallery styles.
2414       *                    Defaults to false if the theme supports HTML5 galleries.
2415       *                    Otherwise, defaults to true.
2416       */
2417      if ( apply_filters( 'use_default_gallery_style', ! $html5 ) ) {
2418          $type_attr = current_theme_supports( 'html5', 'style' ) ? '' : ' type="text/css"';
2419  
2420          $gallery_style = "
2421          <style{$type_attr}>
2422              #{$selector} {
2423                  margin: auto;
2424              }
2425              #{$selector} .gallery-item {
2426                  float: {$float};
2427                  margin-top: 10px;
2428                  text-align: center;
2429                  width: {$itemwidth}%;
2430              }
2431              #{$selector} img {
2432                  border: 2px solid #cfcfcf;
2433              }
2434              #{$selector} .gallery-caption {
2435                  margin-left: 0;
2436              }
2437              /* see gallery_shortcode() in wp-includes/media.php */
2438          </style>\n\t\t";
2439      }
2440  
2441      $size_class  = sanitize_html_class( is_array( $atts['size'] ) ? implode( 'x', $atts['size'] ) : $atts['size'] );
2442      $gallery_div = "<div id='$selector' class='gallery galleryid-{$id} gallery-columns-{$columns} gallery-size-{$size_class}'>";
2443  
2444      /**
2445       * Filters the default gallery shortcode CSS styles.
2446       *
2447       * @since 2.5.0
2448       *
2449       * @param string $gallery_style Default CSS styles and opening HTML div container
2450       *                              for the gallery shortcode output.
2451       */
2452      $output = apply_filters( 'gallery_style', $gallery_style . $gallery_div );
2453  
2454      $i = 0;
2455  
2456      foreach ( $attachments as $id => $attachment ) {
2457  
2458          $attr = ( trim( $attachment->post_excerpt ) ) ? array( 'aria-describedby' => "$selector-$id" ) : '';
2459  
2460          if ( ! empty( $atts['link'] ) && 'file' === $atts['link'] ) {
2461              $image_output = wp_get_attachment_link( $id, $atts['size'], false, false, false, $attr );
2462          } elseif ( ! empty( $atts['link'] ) && 'none' === $atts['link'] ) {
2463              $image_output = wp_get_attachment_image( $id, $atts['size'], false, $attr );
2464          } else {
2465              $image_output = wp_get_attachment_link( $id, $atts['size'], true, false, false, $attr );
2466          }
2467  
2468          $image_meta = wp_get_attachment_metadata( $id );
2469  
2470          $orientation = '';
2471  
2472          if ( isset( $image_meta['height'], $image_meta['width'] ) ) {
2473              $orientation = ( $image_meta['height'] > $image_meta['width'] ) ? 'portrait' : 'landscape';
2474          }
2475  
2476          $output .= "<{$itemtag} class='gallery-item'>";
2477          $output .= "
2478              <{$icontag} class='gallery-icon {$orientation}'>
2479                  $image_output
2480              </{$icontag}>";
2481  
2482          if ( $captiontag && trim( $attachment->post_excerpt ) ) {
2483              $output .= "
2484                  <{$captiontag} class='wp-caption-text gallery-caption' id='$selector-$id'>
2485                  " . wptexturize( $attachment->post_excerpt ) . "
2486                  </{$captiontag}>";
2487          }
2488  
2489          $output .= "</{$itemtag}>";
2490  
2491          if ( ! $html5 && $columns > 0 && 0 === ++$i % $columns ) {
2492              $output .= '<br style="clear: both" />';
2493          }
2494      }
2495  
2496      if ( ! $html5 && $columns > 0 && 0 !== $i % $columns ) {
2497          $output .= "
2498              <br style='clear: both' />";
2499      }
2500  
2501      $output .= "
2502          </div>\n";
2503  
2504      return $output;
2505  }
2506  
2507  /**
2508   * Outputs the templates used by playlists.
2509   *
2510   * @since 3.9.0
2511   */
2512  function wp_underscore_playlist_templates() {
2513      ?>
2514  <script type="text/html" id="tmpl-wp-playlist-current-item">
2515      <# if ( data.thumb && data.thumb.src ) { #>
2516          <img src="{{ data.thumb.src }}" alt="" />
2517      <# } #>
2518      <div class="wp-playlist-caption">
2519          <span class="wp-playlist-item-meta wp-playlist-item-title">
2520          <?php
2521              /* translators: %s: Playlist item title. */
2522              printf( _x( '&#8220;%s&#8221;', 'playlist item title' ), '{{ data.title }}' );
2523          ?>
2524          </span>
2525          <# if ( data.meta.album ) { #><span class="wp-playlist-item-meta wp-playlist-item-album">{{ data.meta.album }}</span><# } #>
2526          <# if ( data.meta.artist ) { #><span class="wp-playlist-item-meta wp-playlist-item-artist">{{ data.meta.artist }}</span><# } #>
2527      </div>
2528  </script>
2529  <script type="text/html" id="tmpl-wp-playlist-item">
2530      <div class="wp-playlist-item">
2531          <a class="wp-playlist-caption" href="{{ data.src }}">
2532              {{ data.index ? ( data.index + '. ' ) : '' }}
2533              <# if ( data.caption ) { #>
2534                  {{ data.caption }}
2535              <# } else { #>
2536                  <span class="wp-playlist-item-title">
2537                  <?php
2538                      /* translators: %s: Playlist item title. */
2539                      printf( _x( '&#8220;%s&#8221;', 'playlist item title' ), '{{{ data.title }}}' );
2540                  ?>
2541                  </span>
2542                  <# if ( data.artists && data.meta.artist ) { #>
2543                  <span class="wp-playlist-item-artist"> &mdash; {{ data.meta.artist }}</span>
2544                  <# } #>
2545              <# } #>
2546          </a>
2547          <# if ( data.meta.length_formatted ) { #>
2548          <div class="wp-playlist-item-length">{{ data.meta.length_formatted }}</div>
2549          <# } #>
2550      </div>
2551  </script>
2552      <?php
2553  }
2554  
2555  /**
2556   * Outputs and enqueue default scripts and styles for playlists.
2557   *
2558   * @since 3.9.0
2559   *
2560   * @param string $type Type of playlist. Accepts 'audio' or 'video'.
2561   */
2562  function wp_playlist_scripts( $type ) {
2563      wp_enqueue_style( 'wp-mediaelement' );
2564      wp_enqueue_script( 'wp-playlist' );
2565      ?>
2566  <!--[if lt IE 9]><script>document.createElement('<?php echo esc_js( $type ); ?>');</script><![endif]-->
2567      <?php
2568      add_action( 'wp_footer', 'wp_underscore_playlist_templates', 0 );
2569      add_action( 'admin_footer', 'wp_underscore_playlist_templates', 0 );
2570  }
2571  
2572  /**
2573   * Builds the Playlist shortcode output.
2574   *
2575   * This implements the functionality of the playlist shortcode for displaying
2576   * a collection of WordPress audio or video files in a post.
2577   *
2578   * @since 3.9.0
2579   *
2580   * @global int $content_width
2581   *
2582   * @param array $attr {
2583   *     Array of default playlist attributes.
2584   *
2585   *     @type string  $type         Type of playlist to display. Accepts 'audio' or 'video'. Default 'audio'.
2586   *     @type string  $order        Designates ascending or descending order of items in the playlist.
2587   *                                 Accepts 'ASC', 'DESC'. Default 'ASC'.
2588   *     @type string  $orderby      Any column, or columns, to sort the playlist. If $ids are
2589   *                                 passed, this defaults to the order of the $ids array ('post__in').
2590   *                                 Otherwise default is 'menu_order ID'.
2591   *     @type int     $id           If an explicit $ids array is not present, this parameter
2592   *                                 will determine which attachments are used for the playlist.
2593   *                                 Default is the current post ID.
2594   *     @type array   $ids          Create a playlist out of these explicit attachment IDs. If empty,
2595   *                                 a playlist will be created from all $type attachments of $id.
2596   *                                 Default empty.
2597   *     @type array   $exclude      List of specific attachment IDs to exclude from the playlist. Default empty.
2598   *     @type string  $style        Playlist style to use. Accepts 'light' or 'dark'. Default 'light'.
2599   *     @type bool    $tracklist    Whether to show or hide the playlist. Default true.
2600   *     @type bool    $tracknumbers Whether to show or hide the numbers next to entries in the playlist. Default true.
2601   *     @type bool    $images       Show or hide the video or audio thumbnail (Featured Image/post
2602   *                                 thumbnail). Default true.
2603   *     @type bool    $artists      Whether to show or hide artist name in the playlist. Default true.
2604   * }
2605   *
2606   * @return string Playlist output. Empty string if the passed type is unsupported.
2607   */
2608  function wp_playlist_shortcode( $attr ) {
2609      global $content_width;
2610      $post = get_post();
2611  
2612      static $instance = 0;
2613      $instance++;
2614  
2615      if ( ! empty( $attr['ids'] ) ) {
2616          // 'ids' is explicitly ordered, unless you specify otherwise.
2617          if ( empty( $attr['orderby'] ) ) {
2618              $attr['orderby'] = 'post__in';
2619          }
2620          $attr['include'] = $attr['ids'];
2621      }
2622  
2623      /**
2624       * Filters the playlist output.
2625       *
2626       * Returning a non-empty value from the filter will short-circuit generation
2627       * of the default playlist output, returning the passed value instead.
2628       *
2629       * @since 3.9.0
2630       * @since 4.2.0 The `$instance` parameter was added.
2631       *
2632       * @param string $output   Playlist output. Default empty.
2633       * @param array  $attr     An array of shortcode attributes.
2634       * @param int    $instance Unique numeric ID of this playlist shortcode instance.
2635       */
2636      $output = apply_filters( 'post_playlist', '', $attr, $instance );
2637  
2638      if ( ! empty( $output ) ) {
2639          return $output;
2640      }
2641  
2642      $atts = shortcode_atts(
2643          array(
2644              'type'         => 'audio',
2645              'order'        => 'ASC',
2646              'orderby'      => 'menu_order ID',
2647              'id'           => $post ? $post->ID : 0,
2648              'include'      => '',
2649              'exclude'      => '',
2650              'style'        => 'light',
2651              'tracklist'    => true,
2652              'tracknumbers' => true,
2653              'images'       => true,
2654              'artists'      => true,
2655          ),
2656          $attr,
2657          'playlist'
2658      );
2659  
2660      $id = (int) $atts['id'];
2661  
2662      if ( 'audio' !== $atts['type'] ) {
2663          $atts['type'] = 'video';
2664      }
2665  
2666      $args = array(
2667          'post_status'    => 'inherit',
2668          'post_type'      => 'attachment',
2669          'post_mime_type' => $atts['type'],
2670          'order'          => $atts['order'],
2671          'orderby'        => $atts['orderby'],
2672      );
2673  
2674      if ( ! empty( $atts['include'] ) ) {
2675          $args['include'] = $atts['include'];
2676          $_attachments    = get_posts( $args );
2677  
2678          $attachments = array();
2679          foreach ( $_attachments as $key => $val ) {
2680              $attachments[ $val->ID ] = $_attachments[ $key ];
2681          }
2682      } elseif ( ! empty( $atts['exclude'] ) ) {
2683          $args['post_parent'] = $id;
2684          $args['exclude']     = $atts['exclude'];
2685          $attachments         = get_children( $args );
2686      } else {
2687          $args['post_parent'] = $id;
2688          $attachments         = get_children( $args );
2689      }
2690  
2691      if ( empty( $attachments ) ) {
2692          return '';
2693      }
2694  
2695      if ( is_feed() ) {
2696          $output = "\n";
2697          foreach ( $attachments as $att_id => $attachment ) {
2698              $output .= wp_get_attachment_link( $att_id ) . "\n";
2699          }
2700          return $output;
2701      }
2702  
2703      $outer = 22; // Default padding and border of wrapper.
2704  
2705      $default_width  = 640;
2706      $default_height = 360;
2707  
2708      $theme_width  = empty( $content_width ) ? $default_width : ( $content_width - $outer );
2709      $theme_height = empty( $content_width ) ? $default_height : round( ( $default_height * $theme_width ) / $default_width );
2710  
2711      $data = array(
2712          'type'         => $atts['type'],
2713          // Don't pass strings to JSON, will be truthy in JS.
2714          'tracklist'    => wp_validate_boolean( $atts['tracklist'] ),
2715          'tracknumbers' => wp_validate_boolean( $atts['tracknumbers'] ),
2716          'images'       => wp_validate_boolean( $atts['images'] ),
2717          'artists'      => wp_validate_boolean( $atts['artists'] ),
2718      );
2719  
2720      $tracks = array();
2721      foreach ( $attachments as $attachment ) {
2722          $url   = wp_get_attachment_url( $attachment->ID );
2723          $ftype = wp_check_filetype( $url, wp_get_mime_types() );
2724          $track = array(
2725              'src'         => $url,
2726              'type'        => $ftype['type'],
2727              'title'       => $attachment->post_title,
2728              'caption'     => $attachment->post_excerpt,
2729              'description' => $attachment->post_content,
2730          );
2731  
2732          $track['meta'] = array();
2733          $meta          = wp_get_attachment_metadata( $attachment->ID );
2734          if ( ! empty( $meta ) ) {
2735  
2736              foreach ( wp_get_attachment_id3_keys( $attachment ) as $key => $label ) {
2737                  if ( ! empty( $meta[ $key ] ) ) {
2738                      $track['meta'][ $key ] = $meta[ $key ];
2739                  }
2740              }
2741  
2742              if ( 'video' === $atts['type'] ) {
2743                  if ( ! empty( $meta['width'] ) && ! empty( $meta['height'] ) ) {
2744                      $width        = $meta['width'];
2745                      $height       = $meta['height'];
2746                      $theme_height = round( ( $height * $theme_width ) / $width );
2747                  } else {
2748                      $width  = $default_width;
2749                      $height = $default_height;
2750                  }
2751  
2752                  $track['dimensions'] = array(
2753                      'original' => compact( 'width', 'height' ),
2754                      'resized'  => array(
2755                          'width'  => $theme_width,
2756                          'height' => $theme_height,
2757                      ),
2758                  );
2759              }
2760          }
2761  
2762          if ( $atts['images'] ) {
2763              $thumb_id = get_post_thumbnail_id( $attachment->ID );
2764              if ( ! empty( $thumb_id ) ) {
2765                  list( $src, $width, $height ) = wp_get_attachment_image_src( $thumb_id, 'full' );
2766                  $track['image']               = compact( 'src', 'width', 'height' );
2767                  list( $src, $width, $height ) = wp_get_attachment_image_src( $thumb_id, 'thumbnail' );
2768                  $track['thumb']               = compact( 'src', 'width', 'height' );
2769              } else {
2770                  $src            = wp_mime_type_icon( $attachment->ID );
2771                  $width          = 48;
2772                  $height         = 64;
2773                  $track['image'] = compact( 'src', 'width', 'height' );
2774                  $track['thumb'] = compact( 'src', 'width', 'height' );
2775              }
2776          }
2777  
2778          $tracks[] = $track;
2779      }
2780      $data['tracks'] = $tracks;
2781  
2782      $safe_type  = esc_attr( $atts['type'] );
2783      $safe_style = esc_attr( $atts['style'] );
2784  
2785      ob_start();
2786  
2787      if ( 1 === $instance ) {
2788          /**
2789           * Prints and enqueues playlist scripts, styles, and JavaScript templates.
2790           *
2791           * @since 3.9.0
2792           *
2793           * @param string $type  Type of playlist. Possible values are 'audio' or 'video'.
2794           * @param string $style The 'theme' for the playlist. Core provides 'light' and 'dark'.
2795           */
2796          do_action( 'wp_playlist_scripts', $atts['type'], $atts['style'] );
2797      }
2798      ?>
2799  <div class="wp-playlist wp-<?php echo $safe_type; ?>-playlist wp-playlist-<?php echo $safe_style; ?>">
2800      <?php if ( 'audio' === $atts['type'] ) : ?>
2801          <div class="wp-playlist-current-item"></div>
2802      <?php endif; ?>
2803      <<?php echo $safe_type; ?> controls="controls" preload="none" width="<?php echo (int) $theme_width; ?>"
2804          <?php
2805          if ( 'video' === $safe_type ) {
2806              echo ' height="', (int) $theme_height, '"';
2807          }
2808          ?>
2809      ></<?php echo $safe_type; ?>>
2810      <div class="wp-playlist-next"></div>
2811      <div class="wp-playlist-prev"></div>
2812      <noscript>
2813      <ol>
2814          <?php
2815          foreach ( $attachments as $att_id => $attachment ) {
2816              printf( '<li>%s</li>', wp_get_attachment_link( $att_id ) );
2817          }
2818          ?>
2819      </ol>
2820      </noscript>
2821      <script type="application/json" class="wp-playlist-script"><?php echo wp_json_encode( $data ); ?></script>
2822  </div>
2823      <?php
2824      return ob_get_clean();
2825  }
2826  add_shortcode( 'playlist', 'wp_playlist_shortcode' );
2827  
2828  /**
2829   * Provides a No-JS Flash fallback as a last resort for audio / video.
2830   *
2831   * @since 3.6.0
2832   *
2833   * @param string $url The media element URL.
2834   * @return string Fallback HTML.
2835   */
2836  function wp_mediaelement_fallback( $url ) {
2837      /**
2838       * Filters the Mediaelement fallback output for no-JS.
2839       *
2840       * @since 3.6.0
2841       *
2842       * @param string $output Fallback output for no-JS.
2843       * @param string $url    Media file URL.
2844       */
2845      return apply_filters( 'wp_mediaelement_fallback', sprintf( '<a href="%1$s">%1$s</a>', esc_url( $url ) ), $url );
2846  }
2847  
2848  /**
2849   * Returns a filtered list of supported audio formats.
2850   *
2851   * @since 3.6.0
2852   *
2853   * @return string[] Supported audio formats.
2854   */
2855  function wp_get_audio_extensions() {
2856      /**
2857       * Filters the list of supported audio formats.
2858       *
2859       * @since 3.6.0
2860       *
2861       * @param string[] $extensions An array of supported audio formats. Defaults are
2862       *                            'mp3', 'ogg', 'flac', 'm4a', 'wav'.
2863       */
2864      return apply_filters( 'wp_audio_extensions', array( 'mp3', 'ogg', 'flac', 'm4a', 'wav' ) );
2865  }
2866  
2867  /**
2868   * Returns useful keys to use to lookup data from an attachment's stored metadata.
2869   *
2870   * @since 3.9.0
2871   *
2872   * @param WP_Post $attachment The current attachment, provided for context.
2873   * @param string  $context    Optional. The context. Accepts 'edit', 'display'. Default 'display'.
2874   * @return string[] Key/value pairs of field keys to labels.
2875   */
2876  function wp_get_attachment_id3_keys( $attachment, $context = 'display' ) {
2877      $fields = array(
2878          'artist' => __( 'Artist' ),
2879          'album'  => __( 'Album' ),
2880      );
2881  
2882      if ( 'display' === $context ) {
2883          $fields['genre']            = __( 'Genre' );
2884          $fields['year']             = __( 'Year' );
2885          $fields['length_formatted'] = _x( 'Length', 'video or audio' );
2886      } elseif ( 'js' === $context ) {
2887          $fields['bitrate']      = __( 'Bitrate' );
2888          $fields['bitrate_mode'] = __( 'Bitrate Mode' );
2889      }
2890  
2891      /**
2892       * Filters the editable list of keys to look up data from an attachment's metadata.
2893       *
2894       * @since 3.9.0
2895       *
2896       * @param array   $fields     Key/value pairs of field keys to labels.
2897       * @param WP_Post $attachment Attachment object.
2898       * @param string  $context    The context. Accepts 'edit', 'display'. Default 'display'.
2899       */
2900      return apply_filters( 'wp_get_attachment_id3_keys', $fields, $attachment, $context );
2901  }
2902  /**
2903   * Builds the Audio shortcode output.
2904   *
2905   * This implements the functionality of the Audio Shortcode for displaying
2906   * WordPress mp3s in a post.
2907   *
2908   * @since 3.6.0
2909   *
2910   * @param array  $attr {
2911   *     Attributes of the audio shortcode.
2912   *
2913   *     @type string $src      URL to the source of the audio file. Default empty.
2914   *     @type string $loop     The 'loop' attribute for the `<audio>` element. Default empty.
2915   *     @type string $autoplay The 'autoplay' attribute for the `<audio>` element. Default empty.
2916   *     @type string $preload  The 'preload' attribute for the `<audio>` element. Default 'none'.
2917   *     @type string $class    The 'class' attribute for the `<audio>` element. Default 'wp-audio-shortcode'.
2918   *     @type string $style    The 'style' attribute for the `<audio>` element. Default 'width: 100%;'.
2919   * }
2920   * @param string $content Shortcode content.
2921   * @return string|void HTML content to display audio.
2922   */
2923  function wp_audio_shortcode( $attr, $content = '' ) {
2924      $post_id = get_post() ? get_the_ID() : 0;
2925  
2926      static $instance = 0;
2927      $instance++;
2928  
2929      /**
2930       * Filters the default audio shortcode output.
2931       *
2932       * If the filtered output isn't empty, it will be used instead of generating the default audio template.
2933       *
2934       * @since 3.6.0
2935       *
2936       * @param string $html     Empty variable to be replaced with shortcode markup.
2937       * @param array  $attr     Attributes of the shortcode. @see wp_audio_shortcode()
2938       * @param string $content  Shortcode content.
2939       * @param int    $instance Unique numeric ID of this audio shortcode instance.
2940       */
2941      $override = apply_filters( 'wp_audio_shortcode_override', '', $attr, $content, $instance );
2942  
2943      if ( '' !== $override ) {
2944          return $override;
2945      }
2946  
2947      $audio = null;
2948  
2949      $default_types = wp_get_audio_extensions();
2950      $defaults_atts = array(
2951          'src'      => '',
2952          'loop'     => '',
2953          'autoplay' => '',
2954          'preload'  => 'none',
2955          'class'    => 'wp-audio-shortcode',
2956          'style'    => 'width: 100%;',
2957      );
2958      foreach ( $default_types as $type ) {
2959          $defaults_atts[ $type ] = '';
2960      }
2961  
2962      $atts = shortcode_atts( $defaults_atts, $attr, 'audio' );
2963  
2964      $primary = false;
2965      if ( ! empty( $atts['src'] ) ) {
2966          $type = wp_check_filetype( $atts['src'], wp_get_mime_types() );
2967  
2968          if ( ! in_array( strtolower( $type['ext'] ), $default_types, true ) ) {
2969              return sprintf( '<a class="wp-embedded-audio" href="%s">%s</a>', esc_url( $atts['src'] ), esc_html( $atts['src'] ) );
2970          }
2971  
2972          $primary = true;
2973          array_unshift( $default_types, 'src' );
2974      } else {
2975          foreach ( $default_types as $ext ) {
2976              if ( ! empty( $atts[ $ext ] ) ) {
2977                  $type = wp_check_filetype( $atts[ $ext ], wp_get_mime_types() );
2978  
2979                  if ( strtolower( $type['ext'] ) === $ext ) {
2980                      $primary = true;
2981                  }
2982              }
2983          }
2984      }
2985  
2986      if ( ! $primary ) {
2987          $audios = get_attached_media( 'audio', $post_id );
2988  
2989          if ( empty( $audios ) ) {
2990              return;
2991          }
2992  
2993          $audio       = reset( $audios );
2994          $atts['src'] = wp_get_attachment_url( $audio->ID );
2995  
2996          if ( empty( $atts['src'] ) ) {
2997              return;
2998          }
2999  
3000          array_unshift( $default_types, 'src' );
3001      }
3002  
3003      /**
3004       * Filters the media library used for the audio shortcode.
3005       *
3006       * @since 3.6.0
3007       *
3008       * @param string $library Media library used for the audio shortcode.
3009       */
3010      $library = apply_filters( 'wp_audio_shortcode_library', 'mediaelement' );
3011  
3012      if ( 'mediaelement' === $library && did_action( 'init' ) ) {
3013          wp_enqueue_style( 'wp-mediaelement' );
3014          wp_enqueue_script( 'wp-mediaelement' );
3015      }
3016  
3017      /**
3018       * Filters the class attribute for the audio shortcode output container.
3019       *
3020       * @since 3.6.0
3021       * @since 4.9.0 The `$atts` parameter was added.
3022       *
3023       * @param string $class CSS class or list of space-separated classes.
3024       * @param array  $atts  Array of audio shortcode attributes.
3025       */
3026      $atts['class'] = apply_filters( 'wp_audio_shortcode_class', $atts['class'], $atts );
3027  
3028      $html_atts = array(
3029          'class'    => $atts['class'],
3030          'id'       => sprintf( 'audio-%d-%d', $post_id, $instance ),
3031          'loop'     => wp_validate_boolean( $atts['loop'] ),
3032          'autoplay' => wp_validate_boolean( $atts['autoplay'] ),
3033          'preload'  => $atts['preload'],
3034          'style'    => $atts['style'],
3035      );
3036  
3037      // These ones should just be omitted altogether if they are blank.
3038      foreach ( array( 'loop', 'autoplay', 'preload' ) as $a ) {
3039          if ( empty( $html_atts[ $a ] ) ) {
3040              unset( $html_atts[ $a ] );
3041          }
3042      }
3043  
3044      $attr_strings = array();
3045  
3046      foreach ( $html_atts as $k => $v ) {
3047          $attr_strings[] = $k . '="' . esc_attr( $v ) . '"';
3048      }
3049  
3050      $html = '';
3051  
3052      if ( 'mediaelement' === $library && 1 === $instance ) {
3053          $html .= "<!--[if lt IE 9]><script>document.createElement('audio');</script><![endif]-->\n";
3054      }
3055  
3056      $html .= sprintf( '<audio %s controls="controls">', implode( ' ', $attr_strings ) );
3057  
3058      $fileurl = '';
3059      $source  = '<source type="%s" src="%s" />';
3060  
3061      foreach ( $default_types as $fallback ) {
3062          if ( ! empty( $atts[ $fallback ] ) ) {
3063              if ( empty( $fileurl ) ) {
3064                  $fileurl = $atts[ $fallback ];
3065              }
3066  
3067              $type  = wp_check_filetype( $atts[ $fallback ], wp_get_mime_types() );
3068              $url   = add_query_arg( '_', $instance, $atts[ $fallback ] );
3069              $html .= sprintf( $source, $type['type'], esc_url( $url ) );
3070          }
3071      }
3072  
3073      if ( 'mediaelement' === $library ) {
3074          $html .= wp_mediaelement_fallback( $fileurl );
3075      }
3076  
3077      $html .= '</audio>';
3078  
3079      /**
3080       * Filters the audio shortcode output.
3081       *
3082       * @since 3.6.0
3083       *
3084       * @param string $html    Audio shortcode HTML output.
3085       * @param array  $atts    Array of audio shortcode attributes.
3086       * @param string $audio   Audio file.
3087       * @param int    $post_id Post ID.
3088       * @param string $library Media library used for the audio shortcode.
3089       */
3090      return apply_filters( 'wp_audio_shortcode', $html, $atts, $audio, $post_id, $library );
3091  }
3092  add_shortcode( 'audio', 'wp_audio_shortcode' );
3093  
3094  /**
3095   * Returns a filtered list of supported video formats.
3096   *
3097   * @since 3.6.0
3098   *
3099   * @return string[] List of supported video formats.
3100   */
3101  function wp_get_video_extensions() {
3102      /**
3103       * Filters the list of supported video formats.
3104       *
3105       * @since 3.6.0
3106       *
3107       * @param string[] $extensions An array of supported video formats. Defaults are
3108       *                             'mp4', 'm4v', 'webm', 'ogv', 'flv'.
3109       */
3110      return apply_filters( 'wp_video_extensions', array( 'mp4', 'm4v', 'webm', 'ogv', 'flv' ) );
3111  }
3112  
3113  /**
3114   * Builds the Video shortcode output.
3115   *
3116   * This implements the functionality of the Video Shortcode for displaying
3117   * WordPress mp4s in a post.
3118   *
3119   * @since 3.6.0
3120   *
3121   * @global int $content_width
3122   *
3123   * @param array  $attr {
3124   *     Attributes of the shortcode.
3125   *
3126   *     @type string $src      URL to the source of the video file. Default empty.
3127   *     @type int    $height   Height of the video embed in pixels. Default 360.
3128   *     @type int    $width    Width of the video embed in pixels. Default $content_width or 640.
3129   *     @type string $poster   The 'poster' attribute for the `<video>` element. Default empty.
3130   *     @type string $loop     The 'loop' attribute for the `<video>` element. Default empty.
3131   *     @type string $autoplay The 'autoplay' attribute for the `<video>` element. Default empty.
3132   *     @type string $preload  The 'preload' attribute for the `<video>` element.
3133   *                            Default 'metadata'.
3134   *     @type string $class    The 'class' attribute for the `<video>` element.
3135   *                            Default 'wp-video-shortcode'.
3136   * }
3137   * @param string $content Shortcode content.
3138   * @return string|void HTML content to display video.
3139   */
3140  function wp_video_shortcode( $attr, $content = '' ) {
3141      global $content_width;
3142      $post_id = get_post() ? get_the_ID() : 0;
3143  
3144      static $instance = 0;
3145      $instance++;
3146  
3147      /**
3148       * Filters the default video shortcode output.
3149       *
3150       * If the filtered output isn't empty, it will be used instead of generating
3151       * the default video template.
3152       *
3153       * @since 3.6.0
3154       *
3155       * @see wp_video_shortcode()
3156       *
3157       * @param string $html     Empty variable to be replaced with shortcode markup.
3158       * @param array  $attr     Attributes of the shortcode. @see wp_video_shortcode()
3159       * @param string $content  Video shortcode content.
3160       * @param int    $instance Unique numeric ID of this video shortcode instance.
3161       */
3162      $override = apply_filters( 'wp_video_shortcode_override', '', $attr, $content, $instance );
3163  
3164      if ( '' !== $override ) {
3165          return $override;
3166      }
3167  
3168      $video = null;
3169  
3170      $default_types = wp_get_video_extensions();
3171      $defaults_atts = array(
3172          'src'      => '',
3173          'poster'   => '',
3174          'loop'     => '',
3175          'autoplay' => '',
3176          'preload'  => 'metadata',
3177          'width'    => 640,
3178          'height'   => 360,
3179          'class'    => 'wp-video-shortcode',
3180      );
3181  
3182      foreach ( $default_types as $type ) {
3183          $defaults_atts[ $type ] = '';
3184      }
3185  
3186      $atts = shortcode_atts( $defaults_atts, $attr, 'video' );
3187  
3188      if ( is_admin() ) {
3189          // Shrink the video so it isn't huge in the admin.
3190          if ( $atts['width'] > $defaults_atts['width'] ) {
3191              $atts['height'] = round( ( $atts['height'] * $defaults_atts['width'] ) / $atts['width'] );
3192              $atts['width']  = $defaults_atts['width'];
3193          }
3194      } else {
3195          // If the video is bigger than the theme.
3196          if ( ! empty( $content_width ) && $atts['width'] > $content_width ) {
3197              $atts['height'] = round( ( $atts['height'] * $content_width ) / $atts['width'] );
3198              $atts['width']  = $content_width;
3199          }
3200      }
3201  
3202      $is_vimeo      = false;
3203      $is_youtube    = false;
3204      $yt_pattern    = '#^https?://(?:www\.)?(?:youtube\.com/watch|youtu\.be/)#';
3205      $vimeo_pattern = '#^https?://(.+\.)?vimeo\.com/.*#';
3206  
3207      $primary = false;
3208      if ( ! empty( $atts['src'] ) ) {
3209          $is_vimeo   = ( preg_match( $vimeo_pattern, $atts['src'] ) );
3210          $is_youtube = ( preg_match( $yt_pattern, $atts['src'] ) );
3211  
3212          if ( ! $is_youtube && ! $is_vimeo ) {
3213              $type = wp_check_filetype( $atts['src'], wp_get_mime_types() );
3214  
3215              if ( ! in_array( strtolower( $type['ext'] ), $default_types, true ) ) {
3216                  return sprintf( '<a class="wp-embedded-video" href="%s">%s</a>', esc_url( $atts['src'] ), esc_html( $atts['src'] ) );
3217              }
3218          }
3219  
3220          if ( $is_vimeo ) {
3221              wp_enqueue_script( 'mediaelement-vimeo' );
3222          }
3223  
3224          $primary = true;
3225          array_unshift( $default_types, 'src' );
3226      } else {
3227          foreach ( $default_types as $ext ) {
3228              if ( ! empty( $atts[ $ext ] ) ) {
3229                  $type = wp_check_filetype( $atts[ $ext ], wp_get_mime_types() );
3230                  if ( strtolower( $type['ext'] ) === $ext ) {
3231                      $primary = true;
3232                  }
3233              }
3234          }
3235      }
3236  
3237      if ( ! $primary ) {
3238          $videos = get_attached_media( 'video', $post_id );
3239          if ( empty( $videos ) ) {
3240              return;
3241          }
3242  
3243          $video       = reset( $videos );
3244          $atts['src'] = wp_get_attachment_url( $video->ID );
3245          if ( empty( $atts['src'] ) ) {
3246              return;
3247          }
3248  
3249          array_unshift( $default_types, 'src' );
3250      }
3251  
3252      /**
3253       * Filters the media library used for the video shortcode.
3254       *
3255       * @since 3.6.0
3256       *
3257       * @param string $library Media library used for the video shortcode.
3258       */
3259      $library = apply_filters( 'wp_video_shortcode_library', 'mediaelement' );
3260      if ( 'mediaelement' === $library && did_action( 'init' ) ) {
3261          wp_enqueue_style( 'wp-mediaelement' );
3262          wp_enqueue_script( 'wp-mediaelement' );
3263          wp_enqueue_script( 'mediaelement-vimeo' );
3264      }
3265  
3266      // MediaElement.js has issues with some URL formats for Vimeo and YouTube,
3267      // so update the URL to prevent the ME.js player from breaking.
3268      if ( 'mediaelement' === $library ) {
3269          if ( $is_youtube ) {
3270              // Remove `feature` query arg and force SSL - see #40866.
3271              $atts['src'] = remove_query_arg( 'feature', $atts['src'] );
3272              $atts['src'] = set_url_scheme( $atts['src'], 'https' );
3273          } elseif ( $is_vimeo ) {
3274              // Remove all query arguments and force SSL - see #40866.
3275              $parsed_vimeo_url = wp_parse_url( $atts['src'] );
3276              $vimeo_src        = 'https://' . $parsed_vimeo_url['host'] . $parsed_vimeo_url['path'];
3277  
3278              // Add loop param for mejs bug - see #40977, not needed after #39686.
3279              $loop        = $atts['loop'] ? '1' : '0';
3280              $atts['src'] = add_query_arg( 'loop', $loop, $vimeo_src );
3281          }
3282      }
3283  
3284      /**
3285       * Filters the class attribute for the video shortcode output container.
3286       *
3287       * @since 3.6.0
3288       * @since 4.9.0 The `$atts` parameter was added.
3289       *
3290       * @param string $class CSS class or list of space-separated classes.
3291       * @param array  $atts  Array of video shortcode attributes.
3292       */
3293      $atts['class'] = apply_filters( 'wp_video_shortcode_class', $atts['class'], $atts );
3294  
3295      $html_atts = array(
3296          'class'    => $atts['class'],
3297          'id'       => sprintf( 'video-%d-%d', $post_id, $instance ),
3298          'width'    => absint( $atts['width'] ),
3299          'height'   => absint( $atts['height'] ),
3300          'poster'   => esc_url( $atts['poster'] ),
3301          'loop'     => wp_validate_boolean( $atts['loop'] ),
3302          'autoplay' => wp_validate_boolean( $atts['autoplay'] ),
3303          'preload'  => $atts['preload'],
3304      );
3305  
3306      // These ones should just be omitted altogether if they are blank.
3307      foreach ( array( 'poster', 'loop', 'autoplay', 'preload' ) as $a ) {
3308          if ( empty( $html_atts[ $a ] ) ) {
3309              unset( $html_atts[ $a ] );
3310          }
3311      }
3312  
3313      $attr_strings = array();
3314      foreach ( $html_atts as $k => $v ) {
3315          $attr_strings[] = $k . '="' . esc_attr( $v ) . '"';
3316      }
3317  
3318      $html = '';
3319  
3320      if ( 'mediaelement' === $library && 1 === $instance ) {
3321          $html .= "<!--[if lt IE 9]><script>document.createElement('video');</script><![endif]-->\n";
3322      }
3323  
3324      $html .= sprintf( '<video %s controls="controls">', implode( ' ', $attr_strings ) );
3325  
3326      $fileurl = '';
3327      $source  = '<source type="%s" src="%s" />';
3328  
3329      foreach ( $default_types as $fallback ) {
3330          if ( ! empty( $atts[ $fallback ] ) ) {
3331              if ( empty( $fileurl ) ) {
3332                  $fileurl = $atts[ $fallback ];
3333              }
3334              if ( 'src' === $fallback && $is_youtube ) {
3335                  $type = array( 'type' => 'video/youtube' );
3336              } elseif ( 'src' === $fallback && $is_vimeo ) {
3337                  $type = array( 'type' => 'video/vimeo' );
3338              } else {
3339                  $type = wp_check_filetype( $atts[ $fallback ], wp_get_mime_types() );
3340              }
3341              $url   = add_query_arg( '_', $instance, $atts[ $fallback ] );
3342              $html .= sprintf( $source, $type['type'], esc_url( $url ) );
3343          }
3344      }
3345  
3346      if ( ! empty( $content ) ) {
3347          if ( false !== strpos( $content, "\n" ) ) {
3348              $content = str_replace( array( "\r\n", "\n", "\t" ), '', $content );
3349          }
3350          $html .= trim( $content );
3351      }
3352  
3353      if ( 'mediaelement' === $library ) {
3354          $html .= wp_mediaelement_fallback( $fileurl );
3355      }
3356      $html .= '</video>';
3357  
3358      $width_rule = '';
3359      if ( ! empty( $atts['width'] ) ) {
3360          $width_rule = sprintf( 'width: %dpx;', $atts['width'] );
3361      }
3362      $output = sprintf( '<div style="%s" class="wp-video">%s</div>', $width_rule, $html );
3363  
3364      /**
3365       * Filters the output of the video shortcode.
3366       *
3367       * @since 3.6.0
3368       *
3369       * @param string $output  Video shortcode HTML output.
3370       * @param array  $atts    Array of video shortcode attributes.
3371       * @param string $video   Video file.
3372       * @param int    $post_id Post ID.
3373       * @param string $library Media library used for the video shortcode.
3374       */
3375      return apply_filters( 'wp_video_shortcode', $output, $atts, $video, $post_id, $library );
3376  }
3377  add_shortcode( 'video', 'wp_video_shortcode' );
3378  
3379  /**
3380   * Gets the previous image link that has the same post parent.
3381   *
3382   * @since 5.8.0
3383   *
3384   * @see get_adjacent_image_link()
3385   *
3386   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
3387   *                           of width and height values in pixels (in that order). Default 'thumbnail'.
3388   * @param string|false $text Optional. Link text. Default false.
3389   * @return string Markup for previous image link.
3390   */
3391  function get_previous_image_link( $size = 'thumbnail', $text = false ) {
3392      return get_adjacent_image_link( true, $size, $text );
3393  }
3394  
3395  /**
3396   * Displays previous image link that has the same post parent.
3397   *
3398   * @since 2.5.0
3399   *
3400   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
3401   *                           of width and height values in pixels (in that order). Default 'thumbnail'.
3402   * @param string|false $text Optional. Link text. Default false.
3403   */
3404  function previous_image_link( $size = 'thumbnail', $text = false ) {
3405      echo get_previous_image_link( $size, $text );
3406  }
3407  
3408  /**
3409   * Gets the next image link that has the same post parent.
3410   *
3411   * @since 5.8.0
3412   *
3413   * @see get_adjacent_image_link()
3414   *
3415   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
3416   *                           of width and height values in pixels (in that order). Default 'thumbnail'.
3417   * @param string|false $text Optional. Link text. Default false.
3418   * @return string Markup for next image link.
3419   */
3420  function get_next_image_link( $size = 'thumbnail', $text = false ) {
3421      return get_adjacent_image_link( false, $size, $text );
3422  }
3423  
3424  /**
3425   * Displays next image link that has the same post parent.
3426   *
3427   * @since 2.5.0
3428   *
3429   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
3430   *                           of width and height values in pixels (in that order). Default 'thumbnail'.
3431   * @param string|false $text Optional. Link text. Default false.
3432   */
3433  function next_image_link( $size = 'thumbnail', $text = false ) {
3434      echo get_next_image_link( $size, $text );
3435  }
3436  
3437  /**
3438   * Gets the next or previous image link that has the same post parent.
3439   *
3440   * Retrieves the current attachment object from the $post global.
3441   *
3442   * @since 5.8.0
3443   *
3444   * @param bool         $prev Optional. Whether to display the next (false) or previous (true) link. Default true.
3445   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
3446   *                           of width and height values in pixels (in that order). Default 'thumbnail'.
3447   * @param bool         $text Optional. Link text. Default false.
3448   * @return string Markup for image link.
3449   */
3450  function get_adjacent_image_link( $prev = true, $size = 'thumbnail', $text = false ) {
3451      $post        = get_post();
3452      $attachments = array_values(
3453          get_children(
3454              array(
3455                  'post_parent'    => $post->post_parent,
3456                  'post_status'    => 'inherit',
3457                  'post_type'      => 'attachment',
3458                  'post_mime_type' => 'image',
3459                  'order'          => 'ASC',
3460                  'orderby'        => 'menu_order ID',
3461              )
3462          )
3463      );
3464  
3465      foreach ( $attachments as $k => $attachment ) {
3466          if ( (int) $attachment->ID === (int) $post->ID ) {
3467              break;
3468          }
3469      }
3470  
3471      $output        = '';
3472      $attachment_id = 0;
3473  
3474      if ( $attachments ) {
3475          $k = $prev ? $k - 1 : $k + 1;
3476  
3477          if ( isset( $attachments[ $k ] ) ) {
3478              $attachment_id = $attachments[ $k ]->ID;
3479              $attr          = array( 'alt' => get_the_title( $attachment_id ) );
3480              $output        = wp_get_attachment_link( $attachment_id, $size, true, false, $text, $attr );
3481          }
3482      }
3483  
3484      $adjacent = $prev ? 'previous' : 'next';
3485  
3486      /**
3487       * Filters the adjacent image link.
3488       *
3489       * The dynamic portion of the hook name, `$adjacent`, refers to the type of adjacency,
3490       * either 'next', or 'previous'.
3491       *
3492       * Possible hook names include:
3493       *
3494       *  - `next_image_link`
3495       *  - `previous_image_link`
3496       *
3497       * @since 3.5.0
3498       *
3499       * @param string $output        Adjacent image HTML markup.
3500       * @param int    $attachment_id Attachment ID
3501       * @param string|int[] $size    Requested image size. Can be any registered image size name, or
3502       *                              an array of width and height values in pixels (in that order).
3503       * @param string $text          Link text.
3504       */
3505      return apply_filters( "{$adjacent}_image_link", $output, $attachment_id, $size, $text );
3506  }
3507  
3508  /**
3509   * Displays next or previous image link that has the same post parent.
3510   *
3511   * Retrieves the current attachment object from the $post global.
3512   *
3513   * @since 2.5.0
3514   *
3515   * @param bool         $prev Optional. Whether to display the next (false) or previous (true) link. Default true.
3516   * @param string|int[] $size Optional. Image size. Accepts any registered image size name, or an array
3517   *                           of width and height values in pixels (in that order). Default 'thumbnail'.
3518   * @param bool         $text Optional. Link text. Default false.
3519   */
3520  function adjacent_image_link( $prev = true, $size = 'thumbnail', $text = false ) {
3521      echo get_adjacent_image_link( $prev, $size, $text );
3522  }
3523  
3524  /**
3525   * Retrieves taxonomies attached to given the attachment.
3526   *
3527   * @since 2.5.0
3528   * @since 4.7.0 Introduced the `$output` parameter.
3529   *
3530   * @param int|array|object $attachment Attachment ID, data array, or data object.
3531   * @param string           $output     Output type. 'names' to return an array of taxonomy names,
3532   *                                     or 'objects' to return an array of taxonomy objects.
3533   *                                     Default is 'names'.
3534   * @return string[]|WP_Taxonomy[] List of taxonomies or taxonomy names. Empty array on failure.
3535   */
3536  function get_attachment_taxonomies( $attachment, $output = 'names' ) {
3537      if ( is_int( $attachment ) ) {
3538          $attachment = get_post( $attachment );
3539      } elseif ( is_array( $attachment ) ) {
3540          $attachment = (object) $attachment;
3541      }
3542  
3543      if ( ! is_object( $attachment ) ) {
3544          return array();
3545      }
3546  
3547      $file     = get_attached_file( $attachment->ID );
3548      $filename = wp_basename( $file );
3549  
3550      $objects = array( 'attachment' );
3551  
3552      if ( false !== strpos( $filename, '.' ) ) {
3553          $objects[] = 'attachment:' . substr( $filename, strrpos( $filename, '.' ) + 1 );
3554      }
3555  
3556      if ( ! empty( $attachment->post_mime_type ) ) {
3557          $objects[] = 'attachment:' . $attachment->post_mime_type;
3558  
3559          if ( false !== strpos( $attachment->post_mime_type, '/' ) ) {
3560              foreach ( explode( '/', $attachment->post_mime_type ) as $token ) {
3561                  if ( ! empty( $token ) ) {
3562                      $objects[] = "attachment:$token";
3563                  }
3564              }
3565          }
3566      }
3567  
3568      $taxonomies = array();
3569  
3570      foreach ( $objects as $object ) {
3571          $taxes = get_object_taxonomies( $object, $output );
3572  
3573          if ( $taxes ) {
3574              $taxonomies = array_merge( $taxonomies, $taxes );
3575          }
3576      }
3577  
3578      if ( 'names' === $output ) {
3579          $taxonomies = array_unique( $taxonomies );
3580      }
3581  
3582      return $taxonomies;
3583  }
3584  
3585  /**
3586   * Retrieves all of the taxonomies that are registered for attachments.
3587   *
3588   * Handles mime-type-specific taxonomies such as attachment:image and attachment:video.
3589   *
3590   * @since 3.5.0
3591   *
3592   * @see get_taxonomies()
3593   *
3594   * @param string $output Optional. The type of taxonomy output to return. Accepts 'names' or 'objects'.
3595   *                       Default 'names'.
3596   * @return string[]|WP_Taxonomy[] Array of names or objects of registered taxonomies for attachments.
3597   */
3598  function get_taxonomies_for_attachments( $output = 'names' ) {
3599      $taxonomies = array();
3600  
3601      foreach ( get_taxonomies( array(), 'objects' ) as $taxonomy ) {
3602          foreach ( $taxonomy->object_type as $object_type ) {
3603              if ( 'attachment' === $object_type || 0 === strpos( $object_type, 'attachment:' ) ) {
3604                  if ( 'names' === $output ) {
3605                      $taxonomies[] = $taxonomy->name;
3606                  } else {
3607                      $taxonomies[ $taxonomy->name ] = $taxonomy;
3608                  }
3609                  break;
3610              }
3611          }
3612      }
3613  
3614      return $taxonomies;
3615  }
3616  
3617  /**
3618   * Determines whether the value is an acceptable type for GD image functions.
3619   *
3620   * In PHP 8.0, the GD extension uses GdImage objects for its data structures.
3621   * This function checks if the passed value is either a resource of type `gd`
3622   * or a GdImage object instance. Any other type will return false.
3623   *
3624   * @since 5.6.0
3625   *
3626   * @param resource|GdImage|false $image A value to check the type for.
3627   * @return bool True if $image is either a GD image resource or GdImage instance,
3628   *              false otherwise.
3629   */
3630  function is_gd_image( $image ) {
3631      if ( is_resource( $image ) && 'gd' === get_resource_type( $image )
3632          || is_object( $image ) && $image instanceof GdImage
3633      ) {
3634          return true;
3635      }
3636  
3637      return false;
3638  }
3639  
3640  /**
3641   * Create new GD image resource with transparency support
3642   *
3643   * @todo Deprecate if possible.
3644   *
3645   * @since 2.9.0
3646   *
3647   * @param int $width  Image width in pixels.
3648   * @param int $height Image height in pixels.
3649   * @return resource|GdImage|false The GD image resource or GdImage instance on success.
3650   *                                False on failure.
3651   */
3652  function wp_imagecreatetruecolor( $width, $height ) {
3653      $img = imagecreatetruecolor( $width, $height );
3654  
3655      if ( is_gd_image( $img )
3656          && function_exists( 'imagealphablending' ) && function_exists( 'imagesavealpha' )
3657      ) {
3658          imagealphablending( $img, false );
3659          imagesavealpha( $img, true );
3660      }
3661  
3662      return $img;
3663  }
3664  
3665  /**
3666   * Based on a supplied width/height example, return the biggest possible dimensions based on the max width/height.
3667   *
3668   * @since 2.9.0
3669   *
3670   * @see wp_constrain_dimensions()
3671   *
3672   * @param int $example_width  The width of an example embed.
3673   * @param int $example_height The height of an example embed.
3674   * @param int $max_width      The maximum allowed width.
3675   * @param int $max_height     The maximum allowed height.
3676   * @return int[] {
3677   *     An array of maximum width and height values.
3678   *
3679   *     @type int $0 The maximum width in pixels.
3680   *     @type int $1 The maximum height in pixels.
3681   * }
3682   */
3683  function wp_expand_dimensions( $example_width, $example_height, $max_width, $max_height ) {
3684      $example_width  = (int) $example_width;
3685      $example_height = (int) $example_height;
3686      $max_width      = (int) $max_width;
3687      $max_height     = (int) $max_height;
3688  
3689      return wp_constrain_dimensions( $example_width * 1000000, $example_height * 1000000, $max_width, $max_height );
3690  }
3691  
3692  /**
3693   * Determines the maximum upload size allowed in php.ini.
3694   *
3695   * @since 2.5.0
3696   *
3697   * @return int Allowed upload size.
3698   */
3699  function wp_max_upload_size() {
3700      $u_bytes = wp_convert_hr_to_bytes( ini_get( 'upload_max_filesize' ) );
3701      $p_bytes = wp_convert_hr_to_bytes( ini_get( 'post_max_size' ) );
3702  
3703      /**
3704       * Filters the maximum upload size allowed in php.ini.
3705       *
3706       * @since 2.5.0
3707       *
3708       * @param int $size    Max upload size limit in bytes.
3709       * @param int $u_bytes Maximum upload filesize in bytes.
3710       * @param int $p_bytes Maximum size of POST data in bytes.
3711       */
3712      return apply_filters( 'upload_size_limit', min( $u_bytes, $p_bytes ), $u_bytes, $p_bytes );
3713  }
3714  
3715  /**
3716   * Returns a WP_Image_Editor instance and loads file into it.
3717   *
3718   * @since 3.5.0
3719   *
3720   * @param string $path Path to the file to load.
3721   * @param array  $args Optional. Additional arguments for retrieving the image editor.
3722   *                     Default empty array.
3723   * @return WP_Image_Editor|WP_Error The WP_Image_Editor object on success,
3724   *                                  a WP_Error object otherwise.
3725   */
3726  function wp_get_image_editor( $path, $args = array() ) {
3727      $args['path'] = $path;
3728  
3729      if ( ! isset( $args['mime_type'] ) ) {
3730          $file_info = wp_check_filetype( $args['path'] );
3731  
3732          // If $file_info['type'] is false, then we let the editor attempt to
3733          // figure out the file type, rather than forcing a failure based on extension.
3734          if ( isset( $file_info ) && $file_info['type'] ) {
3735              $args['mime_type'] = $file_info['type'];
3736          }
3737      }
3738  
3739      $implementation = _wp_image_editor_choose( $args );
3740  
3741      if ( $implementation ) {
3742          $editor = new $implementation( $path );
3743          $loaded = $editor->load();
3744  
3745          if ( is_wp_error( $loaded ) ) {
3746              return $loaded;
3747          }
3748  
3749          return $editor;
3750      }
3751  
3752      return new WP_Error( 'image_no_editor', __( 'No editor could be selected.' ) );
3753  }
3754  
3755  /**
3756   * Tests whether there is an editor that supports a given mime type or methods.
3757   *
3758   * @since 3.5.0
3759   *
3760   * @param string|array $args Optional. Array of arguments to retrieve the image editor supports.
3761   *                           Default empty array.
3762   * @return bool True if an eligible editor is found; false otherwise.
3763   */
3764  function wp_image_editor_supports( $args = array() ) {
3765      return (bool) _wp_image_editor_choose( $args );
3766  }
3767  
3768  /**
3769   * Tests which editors are capable of supporting the request.
3770   *
3771   * @ignore
3772   * @since 3.5.0
3773   *
3774   * @param array $args Optional. Array of arguments for choosing a capable editor. Default empty array.
3775   * @return string|false Class name for the first editor that claims to support the request.
3776   *                      False if no editor claims to support the request.
3777   */
3778  function _wp_image_editor_choose( $args = array() ) {
3779      require_once  ABSPATH . WPINC . '/class-wp-image-editor.php';
3780      require_once  ABSPATH . WPINC . '/class-wp-image-editor-gd.php';
3781      require_once  ABSPATH . WPINC . '/class-wp-image-editor-imagick.php';
3782      /**
3783       * Filters the list of image editing library classes.
3784       *
3785       * @since 3.5.0
3786       *
3787       * @param string[] $image_editors Array of available image editor class names. Defaults are
3788       *                                'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD'.
3789       */
3790      $implementations = apply_filters( 'wp_image_editors', array( 'WP_Image_Editor_Imagick', 'WP_Image_Editor_GD' ) );
3791  
3792      foreach ( $implementations as $implementation ) {
3793          if ( ! call_user_func( array( $implementation, 'test' ), $args ) ) {
3794              continue;
3795          }
3796  
3797          if ( isset( $args['mime_type'] ) &&
3798              ! call_user_func(
3799                  array( $implementation, 'supports_mime_type' ),
3800                  $args['mime_type']
3801              ) ) {
3802              continue;
3803          }
3804  
3805          if ( isset( $args['methods'] ) &&
3806              array_diff( $args['methods'], get_class_methods( $implementation ) ) ) {
3807  
3808              continue;
3809          }
3810  
3811          return $implementation;
3812      }
3813  
3814      return false;
3815  }
3816  
3817  /**
3818   * Prints default Plupload arguments.
3819   *
3820   * @since 3.4.0
3821   */
3822  function wp_plupload_default_settings() {
3823      $wp_scripts = wp_scripts();
3824  
3825      $data = $wp_scripts->get_data( 'wp-plupload', 'data' );
3826      if ( $data && false !== strpos( $data, '_wpPluploadSettings' ) ) {
3827          return;
3828      }
3829  
3830      $max_upload_size    = wp_max_upload_size();
3831      $allowed_extensions = array_keys( get_allowed_mime_types() );
3832      $extensions         = array();
3833      foreach ( $allowed_extensions as $extension ) {
3834          $extensions = array_merge( $extensions, explode( '|', $extension ) );
3835      }
3836  
3837      /*
3838       * Since 4.9 the `runtimes` setting is hardcoded in our version of Plupload to `html5,html4`,
3839       * and the `flash_swf_url` and `silverlight_xap_url` are not used.
3840       */
3841      $defaults = array(
3842          'file_data_name' => 'async-upload', // Key passed to $_FILE.
3843          'url'            => admin_url( 'async-upload.php', 'relative' ),
3844          'filters'        => array(
3845              'max_file_size' => $max_upload_size . 'b',
3846              'mime_types'    => array( array( 'extensions' => implode( ',', $extensions ) ) ),
3847          ),
3848      );
3849  
3850      /*
3851       * Currently only iOS Safari supports multiple files uploading,
3852       * but iOS 7.x has a bug that prevents uploading of videos when enabled.
3853       * See #29602.
3854       */
3855      if ( wp_is_mobile() && strpos( $_SERVER['HTTP_USER_AGENT'], 'OS 7_' ) !== false &&
3856          strpos( $_SERVER['HTTP_USER_AGENT'], 'like Mac OS X' ) !== false ) {
3857  
3858          $defaults['multi_selection'] = false;
3859      }
3860  
3861      // Check if WebP images can be edited.
3862      if ( ! wp_image_editor_supports( array( 'mime_type' => 'image/webp' ) ) ) {
3863          $defaults['webp_upload_error'] = true;
3864      }
3865  
3866      /**
3867       * Filters the Plupload default settings.
3868       *
3869       * @since 3.4.0
3870       *
3871       * @param array $defaults Default Plupload settings array.
3872       */
3873      $defaults = apply_filters( 'plupload_default_settings', $defaults );
3874  
3875      $params = array(
3876          'action' => 'upload-attachment',
3877      );
3878  
3879      /**
3880       * Filters the Plupload default parameters.
3881       *
3882       * @since 3.4.0
3883       *
3884       * @param array $params Default Plupload parameters array.
3885       */
3886      $params = apply_filters( 'plupload_default_params', $params );
3887  
3888      $params['_wpnonce'] = wp_create_nonce( 'media-form' );
3889  
3890      $defaults['multipart_params'] = $params;
3891  
3892      $settings = array(
3893          'defaults'      => $defaults,
3894          'browser'       => array(
3895              'mobile'    => wp_is_mobile(),
3896              'supported' => _device_can_upload(),
3897          ),
3898          'limitExceeded' => is_multisite() && ! is_upload_space_available(),
3899      );
3900  
3901      $script = 'var _wpPluploadSettings = ' . wp_json_encode( $settings ) . ';';
3902  
3903      if ( $data ) {
3904          $script = "$data\n$script";
3905      }
3906  
3907      $wp_scripts->add_data( 'wp-plupload', 'data', $script );
3908  }
3909  
3910  /**
3911   * Prepares an attachment post object for JS, where it is expected
3912   * to be JSON-encoded and fit into an Attachment model.
3913   *
3914   * @since 3.5.0
3915   *
3916   * @param int|WP_Post $attachment Attachment ID or object.
3917   * @return array|void {
3918   *     Array of attachment details, or void if the parameter does not correspond to an attachment.
3919   *
3920   *     @type string $alt                   Alt text of the attachment.
3921   *     @type string $author                ID of the attachment author, as a string.
3922   *     @type string $authorName            Name of the attachment author.
3923   *     @type string $caption               Caption for the attachment.
3924   *     @type array  $compat                Containing item and meta.
3925   *     @type string $context               Context, whether it's used as the site icon for example.
3926   *     @type int    $date                  Uploaded date, timestamp in milliseconds.
3927   *     @type string $dateFormatted         Formatted date (e.g. June 29, 2018).
3928   *     @type string $description           Description of the attachment.
3929   *     @type string $editLink              URL to the edit page for the attachment.
3930   *     @type string $filename              File name of the attachment.
3931   *     @type string $filesizeHumanReadable Filesize of the attachment in human readable format (e.g. 1 MB).
3932   *     @type int    $filesizeInBytes       Filesize of the attachment in bytes.
3933   *     @type int    $height                If the attachment is an image, represents the height of the image in pixels.
3934   *     @type string $icon                  Icon URL of the attachment (e.g. /wp-includes/images/media/archive.png).
3935   *     @type int    $id                    ID of the attachment.
3936   *     @type string $link                  URL to the attachment.
3937   *     @type int    $menuOrder             Menu order of the attachment post.
3938   *     @type array  $meta                  Meta data for the attachment.
3939   *     @type string $mime                  Mime type of the attachment (e.g. image/jpeg or application/zip).
3940   *     @type int    $modified              Last modified, timestamp in milliseconds.
3941   *     @type string $name                  Name, same as title of the attachment.
3942   *     @type array  $nonces                Nonces for update, delete and edit.
3943   *     @type string $orientation           If the attachment is an image, represents the image orientation
3944   *                                         (landscape or portrait).
3945   *     @type array  $sizes                 If the attachment is an image, contains an array of arrays
3946   *                                         for the images sizes: thumbnail, medium, large, and full.
3947   *     @type string $status                Post status of the attachment (usually 'inherit').
3948   *     @type string $subtype               Mime subtype of the attachment (usually the last part, e.g. jpeg or zip).
3949   *     @type string $title                 Title of the attachment (usually slugified file name without the extension).
3950   *     @type string $type                  Type of the attachment (usually first part of the mime type, e.g. image).
3951   *     @type int    $uploadedTo            Parent post to which the attachment was uploaded.
3952   *     @type string $uploadedToLink        URL to the edit page of the parent post of the attachment.
3953   *     @type string $uploadedToTitle       Post title of the parent of the attachment.
3954   *     @type string $url                   Direct URL to the attachment file (from wp-content).
3955   *     @type int    $width                 If the attachment is an image, represents the width of the image in pixels.
3956   * }
3957   *
3958   */
3959  function wp_prepare_attachment_for_js( $attachment ) {
3960      $attachment = get_post( $attachment );
3961  
3962      if ( ! $attachment ) {
3963          return;
3964      }
3965  
3966      if ( 'attachment' !== $attachment->post_type ) {
3967          return;
3968      }
3969  
3970      $meta = wp_get_attachment_metadata( $attachment->ID );
3971      if ( false !== strpos( $attachment->post_mime_type, '/' ) ) {
3972          list( $type, $subtype ) = explode( '/', $attachment->post_mime_type );
3973      } else {
3974          list( $type, $subtype ) = array( $attachment->post_mime_type, '' );
3975      }
3976  
3977      $attachment_url = wp_get_attachment_url( $attachment->ID );
3978      $base_url       = str_replace( wp_basename( $attachment_url ), '', $attachment_url );
3979  
3980      $response = array(
3981          'id'            => $attachment->ID,
3982          'title'         => $attachment->post_title,
3983          'filename'      => wp_basename( get_attached_file( $attachment->ID ) ),
3984          'url'           => $attachment_url,
3985          'link'          => get_attachment_link( $attachment->ID ),
3986          'alt'           => get_post_meta( $attachment->ID, '_wp_attachment_image_alt', true ),
3987          'author'        => $attachment->post_author,
3988          'description'   => $attachment->post_content,
3989          'caption'       => $attachment->post_excerpt,
3990          'name'          => $attachment->post_name,
3991          'status'        => $attachment->post_status,
3992          'uploadedTo'    => $attachment->post_parent,
3993          'date'          => strtotime( $attachment->post_date_gmt ) * 1000,
3994          'modified'      => strtotime( $attachment->post_modified_gmt ) * 1000,
3995          'menuOrder'     => $attachment->menu_order,
3996          'mime'          => $attachment->post_mime_type,
3997          'type'          => $type,
3998          'subtype'       => $subtype,
3999          'icon'          => wp_mime_type_icon( $attachment->ID ),
4000          'dateFormatted' => mysql2date( __( 'F j, Y' ), $attachment->post_date ),
4001          'nonces'        => array(
4002              'update' => false,
4003              'delete' => false,
4004              'edit'   => false,
4005          ),
4006          'editLink'      => false,
4007          'meta'          => false,
4008      );
4009  
4010      $author = new WP_User( $attachment->post_author );
4011  
4012      if ( $author->exists() ) {
4013          $author_name            = $author->display_name ? $author->display_name : $author->nickname;
4014          $response['authorName'] = html_entity_decode( $author_name, ENT_QUOTES, get_bloginfo( 'charset' ) );
4015          $response['authorLink'] = get_edit_user_link( $author->ID );
4016      } else {
4017          $response['authorName'] = __( '(no author)' );
4018      }
4019  
4020      if ( $attachment->post_parent ) {
4021          $post_parent = get_post( $attachment->post_parent );
4022          if ( $post_parent ) {
4023              $response['uploadedToTitle'] = $post_parent->post_title ? $post_parent->post_title : __( '(no title)' );
4024              $response['uploadedToLink']  = get_edit_post_link( $attachment->post_parent, 'raw' );
4025          }
4026      }
4027  
4028      $attached_file = get_attached_file( $attachment->ID );
4029  
4030      if ( isset( $meta['filesize'] ) ) {
4031          $bytes = $meta['filesize'];
4032      } elseif ( file_exists( $attached_file ) ) {
4033          $bytes = filesize( $attached_file );
4034      } else {
4035          $bytes = '';
4036      }
4037  
4038      if ( $bytes ) {
4039          $response['filesizeInBytes']       = $bytes;
4040          $response['filesizeHumanReadable'] = size_format( $bytes );
4041      }
4042  
4043      $context             = get_post_meta( $attachment->ID, '_wp_attachment_context', true );
4044      $response['context'] = ( $context ) ? $context : '';
4045  
4046      if ( current_user_can( 'edit_post', $attachment->ID ) ) {
4047          $response['nonces']['update'] = wp_create_nonce( 'update-post_' . $attachment->ID );
4048          $response['nonces']['edit']   = wp_create_nonce( 'image_editor-' . $attachment->ID );
4049          $response['editLink']         = get_edit_post_link( $attachment->ID, 'raw' );
4050      }
4051  
4052      if ( current_user_can( 'delete_post', $attachment->ID ) ) {
4053          $response['nonces']['delete'] = wp_create_nonce( 'delete-post_' . $attachment->ID );
4054      }
4055  
4056      if ( $meta && ( 'image' === $type || ! empty( $meta['sizes'] ) ) ) {
4057          $sizes = array();
4058  
4059          /** This filter is documented in wp-admin/includes/media.php */
4060          $possible_sizes = apply_filters(
4061              'image_size_names_choose',
4062              array(
4063                  'thumbnail' => __( 'Thumbnail' ),
4064                  'medium'    => __( 'Medium' ),
4065                  'large'     => __( 'Large' ),
4066                  'full'      => __( 'Full Size' ),
4067              )
4068          );
4069          unset( $possible_sizes['full'] );
4070  
4071          /*
4072           * Loop through all potential sizes that may be chosen. Try to do this with some efficiency.
4073           * First: run the image_downsize filter. If it returns something, we can use its data.
4074           * If the filter does not return something, then image_downsize() is just an expensive way
4075           * to check the image metadata, which we do second.
4076           */
4077          foreach ( $possible_sizes as $size => $label ) {
4078  
4079              /** This filter is documented in wp-includes/media.php */
4080              $downsize = apply_filters( 'image_downsize', false, $attachment->ID, $size );
4081  
4082              if ( $downsize ) {
4083                  if ( empty( $downsize[3] ) ) {
4084                      continue;
4085                  }
4086  
4087                  $sizes[ $size ] = array(
4088                      'height'      => $downsize[2],
4089                      'width'       => $downsize[1],
4090                      'url'         => $downsize[0],
4091                      'orientation' => $downsize[2] > $downsize[1] ? 'portrait' : 'landscape',
4092                  );
4093              } elseif ( isset( $meta['sizes'][ $size ] ) ) {
4094                  // Nothing from the filter, so consult image metadata if we have it.
4095                  $size_meta = $meta['sizes'][ $size ];
4096  
4097                  // We have the actual image size, but might need to further constrain it if content_width is narrower.
4098                  // Thumbnail, medium, and full sizes are also checked against the site's height/width options.
4099                  list( $width, $height ) = image_constrain_size_for_editor( $size_meta['width'], $size_meta['height'], $size, 'edit' );
4100  
4101                  $sizes[ $size ] = array(
4102                      'height'      => $height,
4103                      'width'       => $width,
4104                      'url'         => $base_url . $size_meta['file'],
4105                      'orientation' => $height > $width ? 'portrait' : 'landscape',
4106                  );
4107              }
4108          }
4109  
4110          if ( 'image' === $type ) {
4111              if ( ! empty( $meta['original_image'] ) ) {
4112                  $response['originalImageURL']  = wp_get_original_image_url( $attachment->ID );
4113                  $response['originalImageName'] = wp_basename( wp_get_original_image_path( $attachment->ID ) );
4114              }
4115  
4116              $sizes['full'] = array( 'url' => $attachment_url );
4117  
4118              if ( isset( $meta['height'], $meta['width'] ) ) {
4119                  $sizes['full']['height']      = $meta['height'];
4120                  $sizes['full']['width']       = $meta['width'];
4121                  $sizes['full']['orientation'] = $meta['height'] > $meta['width'] ? 'portrait' : 'landscape';
4122              }
4123  
4124              $response = array_merge( $response, $sizes['full'] );
4125          } elseif ( $meta['sizes']['full']['file'] ) {
4126              $sizes['full'] = array(
4127                  'url'         => $base_url . $meta['sizes']['full']['file'],
4128                  'height'      => $meta['sizes']['full']['height'],
4129                  'width'       => $meta['sizes']['full']['width'],
4130                  'orientation' => $meta['sizes']['full']['height'] > $meta['sizes']['full']['width'] ? 'portrait' : 'landscape',
4131              );
4132          }
4133  
4134          $response = array_merge( $response, array( 'sizes' => $sizes ) );
4135      }
4136  
4137      if ( $meta && 'video' === $type ) {
4138          if ( isset( $meta['width'] ) ) {
4139              $response['width'] = (int) $meta['width'];
4140          }
4141          if ( isset( $meta['height'] ) ) {
4142              $response['height'] = (int) $meta['height'];
4143          }
4144      }
4145  
4146      if ( $meta && ( 'audio' === $type || 'video' === $type ) ) {
4147          if ( isset( $meta['length_formatted'] ) ) {
4148              $response['fileLength']              = $meta['length_formatted'];
4149              $response['fileLengthHumanReadable'] = human_readable_duration( $meta['length_formatted'] );
4150          }
4151  
4152          $response['meta'] = array();
4153          foreach ( wp_get_attachment_id3_keys( $attachment, 'js' ) as $key => $label ) {
4154              $response['meta'][ $key ] = false;
4155  
4156              if ( ! empty( $meta[ $key ] ) ) {
4157                  $response['meta'][ $key ] = $meta[ $key ];
4158              }
4159          }
4160  
4161          $id = get_post_thumbnail_id( $attachment->ID );
4162          if ( ! empty( $id ) ) {
4163              list( $src, $width, $height ) = wp_get_attachment_image_src( $id, 'full' );
4164              $response['image']            = compact( 'src', 'width', 'height' );
4165              list( $src, $width, $height ) = wp_get_attachment_image_src( $id, 'thumbnail' );
4166              $response['thumb']            = compact( 'src', 'width', 'height' );
4167          } else {
4168              $src               = wp_mime_type_icon( $attachment->ID );
4169              $width             = 48;
4170              $height            = 64;
4171              $response['image'] = compact( 'src', 'width', 'height' );
4172              $response['thumb'] = compact( 'src', 'width', 'height' );
4173          }
4174      }
4175  
4176      if ( function_exists( 'get_compat_media_markup' ) ) {
4177          $response['compat'] = get_compat_media_markup( $attachment->ID, array( 'in_modal' => true ) );
4178      }
4179  
4180      if ( function_exists( 'get_media_states' ) ) {
4181          $media_states = get_media_states( $attachment );
4182          if ( ! empty( $media_states ) ) {
4183              $response['mediaStates'] = implode( ', ', $media_states );
4184          }
4185      }
4186  
4187      /**
4188       * Filters the attachment data prepared for JavaScript.
4189       *
4190       * @since 3.5.0
4191       *
4192       * @param array       $response   Array of prepared attachment data. @see wp_prepare_attachment_for_js().
4193       * @param WP_Post     $attachment Attachment object.
4194       * @param array|false $meta       Array of attachment meta data, or false if there is none.
4195       */
4196      return apply_filters( 'wp_prepare_attachment_for_js', $response, $attachment, $meta );
4197  }
4198  
4199  /**
4200   * Enqueues all scripts, styles, settings, and templates necessary to use
4201   * all media JS APIs.
4202   *
4203   * @since 3.5.0
4204   *
4205   * @global int       $content_width
4206   * @global wpdb      $wpdb          WordPress database abstraction object.
4207   * @global WP_Locale $wp_locale     WordPress date and time locale object.
4208   *
4209   * @param array $args {
4210   *     Arguments for enqueuing media scripts.
4211   *
4212   *     @type int|WP_Post A post object or ID.
4213   * }
4214   */
4215  function wp_enqueue_media( $args = array() ) {
4216      // Enqueue me just once per page, please.
4217      if ( did_action( 'wp_enqueue_media' ) ) {
4218          return;
4219      }
4220  
4221      global $content_width, $wpdb, $wp_locale;
4222  
4223      $defaults = array(
4224          'post' => null,
4225      );
4226      $args     = wp_parse_args( $args, $defaults );
4227  
4228      // We're going to pass the old thickbox media tabs to `media_upload_tabs`
4229      // to ensure plugins will work. We will then unset those tabs.
4230      $tabs = array(
4231          // handler action suffix => tab label
4232          'type'     => '',
4233          'type_url' => '',
4234          'gallery'  => '',
4235          'library'  => '',
4236      );
4237  
4238      /** This filter is documented in wp-admin/includes/media.php */
4239      $tabs = apply_filters( 'media_upload_tabs', $tabs );
4240      unset( $tabs['type'], $tabs['type_url'], $tabs['gallery'], $tabs['library'] );
4241  
4242      $props = array(
4243          'link'  => get_option( 'image_default_link_type' ), // DB default is 'file'.
4244          'align' => get_option( 'image_default_align' ),     // Empty default.
4245          'size'  => get_option( 'image_default_size' ),      // Empty default.
4246      );
4247  
4248      $exts      = array_merge( wp_get_audio_extensions(), wp_get_video_extensions() );
4249      $mimes     = get_allowed_mime_types();
4250      $ext_mimes = array();
4251      foreach ( $exts as $ext ) {
4252          foreach ( $mimes as $ext_preg => $mime_match ) {
4253              if ( preg_match( '#' . $ext . '#i', $ext_preg ) ) {
4254                  $ext_mimes[ $ext ] = $mime_match;
4255                  break;
4256              }
4257          }
4258      }
4259  
4260      /**
4261       * Allows showing or hiding the "Create Audio Playlist" button in the media library.
4262       *
4263       * By default, the "Create Audio Playlist" button will always be shown in
4264       * the media library.  If this filter returns `null`, a query will be run
4265       * to determine whether the media library contains any audio items.  This
4266       * was the default behavior prior to version 4.8.0, but this query is
4267       * expensive for large media libraries.
4268       *
4269       * @since 4.7.4
4270       * @since 4.8.0 The filter's default value is `true` rather than `null`.
4271       *
4272       * @link https://core.trac.wordpress.org/ticket/31071
4273       *
4274       * @param bool|null $show Whether to show the button, or `null` to decide based
4275       *                        on whether any audio files exist in the media library.
4276       */
4277      $show_audio_playlist = apply_filters( 'media_library_show_audio_playlist', true );
4278      if ( null === $show_audio_playlist ) {
4279          $show_audio_playlist = $wpdb->get_var(
4280              "
4281              SELECT ID
4282              FROM $wpdb->posts
4283              WHERE post_type = 'attachment'
4284              AND post_mime_type LIKE 'audio%'
4285              LIMIT 1
4286          "
4287          );
4288      }
4289  
4290      /**
4291       * Allows showing or hiding the "Create Video Playlist" button in the media library.
4292       *
4293       * By default, the "Create Video Playlist" button will always be shown in
4294       * the media library.  If this filter returns `null`, a query will be run
4295       * to determine whether the media library contains any video items.  This
4296       * was the default behavior prior to version 4.8.0, but this query is
4297       * expensive for large media libraries.
4298       *
4299       * @since 4.7.4
4300       * @since 4.8.0 The filter's default value is `true` rather than `null`.
4301       *
4302       * @link https://core.trac.wordpress.org/ticket/31071
4303       *
4304       * @param bool|null $show Whether to show the button, or `null` to decide based
4305       *                        on whether any video files exist in the media library.
4306       */
4307      $show_video_playlist = apply_filters( 'media_library_show_video_playlist', true );
4308      if ( null === $show_video_playlist ) {
4309          $show_video_playlist = $wpdb->get_var(
4310              "
4311              SELECT ID
4312              FROM $wpdb->posts
4313              WHERE post_type = 'attachment'
4314              AND post_mime_type LIKE 'video%'
4315              LIMIT 1
4316          "
4317          );
4318      }
4319  
4320      /**
4321       * Allows overriding the list of months displayed in the media library.
4322       *
4323       * By default (if this filter does not return an array), a query will be
4324       * run to determine the months that have media items.  This query can be
4325       * expensive for large media libraries, so it may be desirable for sites to
4326       * override this behavior.
4327       *
4328       * @since 4.7.4
4329       *
4330       * @link https://core.trac.wordpress.org/ticket/31071
4331       *
4332       * @param array|null $months An array of objects with `month` and `year`
4333       *                           properties, or `null` (or any other non-array value)
4334       *                           for default behavior.
4335       */
4336      $months = apply_filters( 'media_library_months_with_files', null );
4337      if ( ! is_array( $months ) ) {
4338          $months = $wpdb->get_results(
4339              $wpdb->prepare(
4340                  "
4341              SELECT DISTINCT YEAR( post_date ) AS year, MONTH( post_date ) AS month
4342              FROM $wpdb->posts
4343              WHERE post_type = %s
4344              ORDER BY post_date DESC
4345          ",
4346                  'attachment'
4347              )
4348          );
4349      }
4350      foreach ( $months as $month_year ) {
4351          $month_year->text = sprintf(
4352              /* translators: 1: Month, 2: Year. */
4353              __( '%1$s %2$d' ),
4354              $wp_locale->get_month( $month_year->month ),
4355              $month_year->year
4356          );
4357      }
4358  
4359      /**
4360       * Filters whether the Media Library grid has infinite scrolling. Default `false`.
4361       *
4362       * @since 5.8.0
4363       *
4364       * @param bool $infinite Whether the Media Library grid has infinite scrolling.
4365       */
4366      $infinite_scrolling = apply_filters( 'media_library_infinite_scrolling', false );
4367  
4368      $settings = array(
4369          'tabs'              => $tabs,
4370          'tabUrl'            => add_query_arg( array( 'chromeless' => true ), admin_url( 'media-upload.php' ) ),
4371          'mimeTypes'         => wp_list_pluck( get_post_mime_types(), 0 ),
4372          /** This filter is documented in wp-admin/includes/media.php */
4373          'captions'          => ! apply_filters( 'disable_captions', '' ),
4374          'nonce'             => array(
4375              'sendToEditor' => wp_create_nonce( 'media-send-to-editor' ),
4376          ),
4377          'post'              => array(
4378              'id' => 0,
4379          ),
4380          'defaultProps'      => $props,
4381          'attachmentCounts'  => array(
4382              'audio' => ( $show_audio_playlist ) ? 1 : 0,
4383              'video' => ( $show_video_playlist ) ? 1 : 0,
4384          ),
4385          'oEmbedProxyUrl'    => rest_url( 'oembed/1.0/proxy' ),
4386          'embedExts'         => $exts,
4387          'embedMimes'        => $ext_mimes,
4388          'contentWidth'      => $content_width,
4389          'months'            => $months,
4390          'mediaTrash'        => MEDIA_TRASH ? 1 : 0,
4391          'infiniteScrolling' => ( $infinite_scrolling ) ? 1 : 0,
4392      );
4393  
4394      $post = null;
4395      if ( isset( $args['post'] ) ) {
4396          $post             = get_post( $args['post'] );
4397          $settings['post'] = array(
4398              'id'    => $post->ID,
4399              'nonce' => wp_create_nonce( 'update-post_' . $post->ID ),
4400          );
4401  
4402          $thumbnail_support = current_theme_supports( 'post-thumbnails', $post->post_type ) && post_type_supports( $post->post_type, 'thumbnail' );
4403          if ( ! $thumbnail_support && 'attachment' === $post->post_type && $post->post_mime_type ) {
4404              if ( wp_attachment_is( 'audio', $post ) ) {
4405                  $thumbnail_support = post_type_supports( 'attachment:audio', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:audio' );
4406              } elseif ( wp_attachment_is( 'video', $post ) ) {
4407                  $thumbnail_support = post_type_supports( 'attachment:video', 'thumbnail' ) || current_theme_supports( 'post-thumbnails', 'attachment:video' );
4408              }
4409          }
4410  
4411          if ( $thumbnail_support ) {
4412              $featured_image_id                   = get_post_meta( $post->ID, '_thumbnail_id', true );
4413              $settings['post']['featuredImageId'] = $featured_image_id ? $featured_image_id : -1;
4414          }
4415      }
4416  
4417      if ( $post ) {
4418          $post_type_object = get_post_type_object( $post->post_type );
4419      } else {
4420          $post_type_object = get_post_type_object( 'post' );
4421      }
4422  
4423      $strings = array(
4424          // Generic.
4425          'mediaFrameDefaultTitle'      => __( 'Media' ),
4426          'url'                         => __( 'URL' ),
4427          'addMedia'                    => __( 'Add media' ),
4428          'search'                      => __( 'Search' ),
4429          'select'                      => __( 'Select' ),
4430          'cancel'                      => __( 'Cancel' ),
4431          'update'                      => __( 'Update' ),
4432          'replace'                     => __( 'Replace' ),
4433          'remove'                      => __( 'Remove' ),
4434          'back'                        => __( 'Back' ),
4435          /*
4436           * translators: This is a would-be plural string used in the media manager.
4437           * If there is not a word you can use in your language to avoid issues with the
4438           * lack of plural support here, turn it into "selected: %d" then translate it.
4439           */
4440          'selected'                    => __( '%d selected' ),
4441          'dragInfo'                    => __( 'Drag and drop to reorder media files.' ),
4442  
4443          // Upload.
4444          'uploadFilesTitle'            => __( 'Upload files' ),
4445          'uploadImagesTitle'           => __( 'Upload images' ),
4446  
4447          // Library.
4448          'mediaLibraryTitle'           => __( 'Media Library' ),
4449          'insertMediaTitle'            => __( 'Add media' ),
4450          'createNewGallery'            => __( 'Create a new gallery' ),
4451          'createNewPlaylist'           => __( 'Create a new playlist' ),
4452          'createNewVideoPlaylist'      => __( 'Create a new video playlist' ),
4453          'returnToLibrary'             => __( '&#8592; Go to library' ),
4454          'allMediaItems'               => __( 'All media items' ),
4455          'allDates'                    => __( 'All dates' ),
4456          'noItemsFound'                => __( 'No items found.' ),
4457          'insertIntoPost'              => $post_type_object->labels->insert_into_item,
4458          'unattached'                  => __( 'Unattached' ),
4459          'mine'                        => _x( 'Mine', 'media items' ),
4460          'trash'                       => _x( 'Trash', 'noun' ),
4461          'uploadedToThisPost'          => $post_type_object->labels->uploaded_to_this_item,
4462          'warnDelete'                  => __( "You are about to permanently delete this item from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
4463          'warnBulkDelete'              => __( "You are about to permanently delete these items from your site.\nThis action cannot be undone.\n 'Cancel' to stop, 'OK' to delete." ),
4464          'warnBulkTrash'               => __( "You are about to trash these items.\n  'Cancel' to stop, 'OK' to delete." ),
4465          'bulkSelect'                  => __( 'Bulk select' ),
4466          'trashSelected'               => __( 'Move to Trash' ),
4467          'restoreSelected'             => __( 'Restore from Trash' ),
4468          'deletePermanently'           => __( 'Delete permanently' ),
4469          'apply'                       => __( 'Apply' ),
4470          'filterByDate'                => __( 'Filter by date' ),
4471          'filterByType'                => __( 'Filter by type' ),
4472          'searchLabel'                 => __( 'Search' ),
4473          'searchMediaLabel'            => __( 'Search media' ),          // Backward compatibility pre-5.3.
4474          'searchMediaPlaceholder'      => __( 'Search media items...' ), // Placeholder (no ellipsis), backward compatibility pre-5.3.
4475          /* translators: %d: Number of attachments found in a search. */
4476          'mediaFound'                  => __( 'Number of media items found: %d' ),
4477          'noMedia'                     => __( 'No media items found.' ),
4478          'noMediaTryNewSearch'         => __( 'No media items found. Try a different search.' ),
4479  
4480          // Library Details.
4481          'attachmentDetails'           => __( 'Attachment details' ),
4482  
4483          // From URL.
4484          'insertFromUrlTitle'          => __( 'Insert from URL' ),
4485  
4486          // Featured Images.
4487          'setFeaturedImageTitle'       => $post_type_object->labels->featured_image,
4488          'setFeaturedImage'            => $post_type_object->labels->set_featured_image,
4489  
4490          // Gallery.
4491          'createGalleryTitle'          => __( 'Create gallery' ),
4492          'editGalleryTitle'            => __( 'Edit gallery' ),
4493          'cancelGalleryTitle'          => __( '&#8592; Cancel gallery' ),
4494          'insertGallery'               => __( 'Insert gallery' ),
4495          'updateGallery'               => __( 'Update gallery' ),
4496          'addToGallery'                => __( 'Add to gallery' ),
4497          'addToGalleryTitle'           => __( 'Add to gallery' ),
4498          'reverseOrder'                => __( 'Reverse order' ),
4499  
4500          // Edit Image.
4501          'imageDetailsTitle'           => __( 'Image details' ),
4502          'imageReplaceTitle'           => __( 'Replace image' ),
4503          'imageDetailsCancel'          => __( 'Cancel edit' ),
4504          'editImage'                   => __( 'Edit image' ),
4505  
4506          // Crop Image.
4507          'chooseImage'                 => __( 'Choose image' ),
4508          'selectAndCrop'               => __( 'Select and crop' ),
4509          'skipCropping'                => __( 'Skip cropping' ),
4510          'cropImage'                   => __( 'Crop image' ),
4511          'cropYourImage'               => __( 'Crop your image' ),
4512          'cropping'                    => __( 'Cropping&hellip;' ),
4513          /* translators: 1: Suggested width number, 2: Suggested height number. */
4514          'suggestedDimensions'         => __( 'Suggested image dimensions: %1$s by %2$s pixels.' ),
4515          'cropError'                   => __( 'There has been an error cropping your image.' ),
4516  
4517          // Edit Audio.
4518          'audioDetailsTitle'           => __( 'Audio details' ),
4519          'audioReplaceTitle'           => __( 'Replace audio' ),
4520          'audioAddSourceTitle'         => __( 'Add audio source' ),
4521          'audioDetailsCancel'          => __( 'Cancel edit' ),
4522  
4523          // Edit Video.
4524          'videoDetailsTitle'           => __( 'Video details' ),
4525          'videoReplaceTitle'           => __( 'Replace video' ),
4526          'videoAddSourceTitle'         => __( 'Add video source' ),
4527          'videoDetailsCancel'          => __( 'Cancel edit' ),
4528          'videoSelectPosterImageTitle' => __( 'Select poster image' ),
4529          'videoAddTrackTitle'          => __( 'Add subtitles' ),
4530  
4531          // Playlist.
4532          'playlistDragInfo'            => __( 'Drag and drop to reorder tracks.' ),
4533          'createPlaylistTitle'         => __( 'Create audio playlist' ),
4534          'editPlaylistTitle'           => __( 'Edit audio playlist' ),
4535          'cancelPlaylistTitle'         => __( '&#8592; Cancel audio playlist' ),
4536          'insertPlaylist'              => __( 'Insert audio playlist' ),
4537          'updatePlaylist'              => __( 'Update audio playlist' ),
4538          'addToPlaylist'               => __( 'Add to audio playlist' ),
4539          'addToPlaylistTitle'          => __( 'Add to Audio Playlist' ),
4540  
4541          // Video Playlist.
4542          'videoPlaylistDragInfo'       => __( 'Drag and drop to reorder videos.' ),
4543          'createVideoPlaylistTitle'    => __( 'Create video playlist' ),
4544          'editVideoPlaylistTitle'      => __( 'Edit video playlist' ),
4545          'cancelVideoPlaylistTitle'    => __( '&#8592; Cancel video playlist' ),
4546          'insertVideoPlaylist'         => __( 'Insert video playlist' ),
4547          'updateVideoPlaylist'         => __( 'Update video playlist' ),
4548          'addToVideoPlaylist'          => __( 'Add to video playlist' ),
4549          'addToVideoPlaylistTitle'     => __( 'Add to video Playlist' ),
4550  
4551          // Headings.
4552          'filterAttachments'           => __( 'Filter media' ),
4553          'attachmentsList'             => __( 'Media list' ),
4554      );
4555  
4556      /**
4557       * Filters the media view settings.
4558       *
4559       * @since 3.5.0
4560       *
4561       * @param array   $settings List of media view settings.
4562       * @param WP_Post $post     Post object.
4563       */
4564      $settings = apply_filters( 'media_view_settings', $settings, $post );
4565  
4566      /**
4567       * Filters the media view strings.
4568       *
4569       * @since 3.5.0
4570       *
4571       * @param string[] $strings Array of media view strings keyed by the name they'll be referenced by in JavaScript.
4572       * @param WP_Post  $post    Post object.
4573       */
4574      $strings = apply_filters( 'media_view_strings', $strings, $post );
4575  
4576      $strings['settings'] = $settings;
4577  
4578      // Ensure we enqueue media-editor first, that way media-views
4579      // is registered internally before we try to localize it. See #24724.
4580      wp_enqueue_script( 'media-editor' );
4581      wp_localize_script( 'media-views', '_wpMediaViewsL10n', $strings );
4582  
4583      wp_enqueue_script( 'media-audiovideo' );
4584      wp_enqueue_style( 'media-views' );
4585      if ( is_admin() ) {
4586          wp_enqueue_script( 'mce-view' );
4587          wp_enqueue_script( 'image-edit' );
4588      }
4589      wp_enqueue_style( 'imgareaselect' );
4590      wp_plupload_default_settings();
4591  
4592      require_once  ABSPATH . WPINC . '/media-template.php';
4593      add_action( 'admin_footer', 'wp_print_media_templates' );
4594      add_action( 'wp_footer', 'wp_print_media_templates' );
4595      add_action( 'customize_controls_print_footer_scripts', 'wp_print_media_templates' );
4596  
4597      /**
4598       * Fires at the conclusion of wp_enqueue_media().
4599       *
4600       * @since 3.5.0
4601       */
4602      do_action( 'wp_enqueue_media' );
4603  }
4604  
4605  /**
4606   * Retrieves media attached to the passed post.
4607   *
4608   * @since 3.6.0
4609   *
4610   * @param string      $type Mime type.
4611   * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
4612   * @return WP_Post[] Array of media attached to the given post.
4613   */
4614  function get_attached_media( $type, $post = 0 ) {
4615      $post = get_post( $post );
4616  
4617      if ( ! $post ) {
4618          return array();
4619      }
4620  
4621      $args = array(
4622          'post_parent'    => $post->ID,
4623          'post_type'      => 'attachment',
4624          'post_mime_type' => $type,
4625          'posts_per_page' => -1,
4626          'orderby'        => 'menu_order',
4627          'order'          => 'ASC',
4628      );
4629  
4630      /**
4631       * Filters arguments used to retrieve media attached to the given post.
4632       *
4633       * @since 3.6.0
4634       *
4635       * @param array   $args Post query arguments.
4636       * @param string  $type Mime type of the desired media.
4637       * @param WP_Post $post Post object.
4638       */
4639      $args = apply_filters( 'get_attached_media_args', $args, $type, $post );
4640  
4641      $children = get_children( $args );
4642  
4643      /**
4644       * Filters the list of media attached to the given post.
4645       *
4646       * @since 3.6.0
4647       *
4648       * @param WP_Post[] $children Array of media attached to the given post.
4649       * @param string    $type     Mime type of the media desired.
4650       * @param WP_Post   $post     Post object.
4651       */
4652      return (array) apply_filters( 'get_attached_media', $children, $type, $post );
4653  }
4654  
4655  /**
4656   * Check the content HTML for a audio, video, object, embed, or iframe tags.
4657   *
4658   * @since 3.6.0
4659   *
4660   * @param string   $content A string of HTML which might contain media elements.
4661   * @param string[] $types   An array of media types: 'audio', 'video', 'object', 'embed', or 'iframe'.
4662   * @return string[] Array of found HTML media elements.
4663   */
4664  function get_media_embedded_in_content( $content, $types = null ) {
4665      $html = array();
4666  
4667      /**
4668       * Filters the embedded media types that are allowed to be returned from the content blob.
4669       *
4670       * @since 4.2.0
4671       *
4672       * @param string[] $allowed_media_types An array of allowed media types. Default media types are
4673       *                                      'audio', 'video', 'object', 'embed', and 'iframe'.
4674       */
4675      $allowed_media_types = apply_filters( 'media_embedded_in_content_allowed_types', array( 'audio', 'video', 'object', 'embed', 'iframe' ) );
4676  
4677      if ( ! empty( $types ) ) {
4678          if ( ! is_array( $types ) ) {
4679              $types = array( $types );
4680          }
4681  
4682          $allowed_media_types = array_intersect( $allowed_media_types, $types );
4683      }
4684  
4685      $tags = implode( '|', $allowed_media_types );
4686  
4687      if ( preg_match_all( '#<(?P<tag>' . $tags . ')[^<]*?(?:>[\s\S]*?<\/(?P=tag)>|\s*\/>)#', $content, $matches ) ) {
4688          foreach ( $matches[0] as $match ) {
4689              $html[] = $match;
4690          }
4691      }
4692  
4693      return $html;
4694  }
4695  
4696  /**
4697   * Retrieves galleries from the passed post's content.
4698   *
4699   * @since 3.6.0
4700   *
4701   * @param int|WP_Post $post Post ID or object.
4702   * @param bool        $html Optional. Whether to return HTML or data in the array. Default true.
4703   * @return array A list of arrays, each containing gallery data and srcs parsed
4704   *               from the expanded shortcode.
4705   */
4706  function get_post_galleries( $post, $html = true ) {
4707      $post = get_post( $post );
4708  
4709      if ( ! $post ) {
4710          return array();
4711      }
4712  
4713      if ( ! has_shortcode( $post->post_content, 'gallery' ) ) {
4714          return array();
4715      }
4716  
4717      $galleries = array();
4718      if ( preg_match_all( '/' . get_shortcode_regex() . '/s', $post->post_content, $matches, PREG_SET_ORDER ) ) {
4719          foreach ( $matches as $shortcode ) {
4720              if ( 'gallery' === $shortcode[2] ) {
4721                  $srcs = array();
4722  
4723                  $shortcode_attrs = shortcode_parse_atts( $shortcode[3] );
4724                  if ( ! is_array( $shortcode_attrs ) ) {
4725                      $shortcode_attrs = array();
4726                  }
4727  
4728                  // Specify the post ID of the gallery we're viewing if the shortcode doesn't reference another post already.
4729                  if ( ! isset( $shortcode_attrs['id'] ) ) {
4730                      $shortcode[3] .= ' id="' . (int) $post->ID . '"';
4731                  }
4732  
4733                  $gallery = do_shortcode_tag( $shortcode );
4734                  if ( $html ) {
4735                      $galleries[] = $gallery;
4736                  } else {
4737                      preg_match_all( '#src=([\'"])(.+?)\1#is', $gallery, $src, PREG_SET_ORDER );
4738                      if ( ! empty( $src ) ) {
4739                          foreach ( $src as $s ) {
4740                              $srcs[] = $s[2];
4741                          }
4742                      }
4743  
4744                      $galleries[] = array_merge(
4745                          $shortcode_attrs,
4746                          array(
4747                              'src' => array_values( array_unique( $srcs ) ),
4748                          )
4749                      );
4750                  }
4751              }
4752          }
4753      }
4754  
4755      /**
4756       * Filters the list of all found galleries in the given post.
4757       *
4758       * @since 3.6.0
4759       *
4760       * @param array   $galleries Associative array of all found post galleries.
4761       * @param WP_Post $post      Post object.
4762       */
4763      return apply_filters( 'get_post_galleries', $galleries, $post );
4764  }
4765  
4766  /**
4767   * Check a specified post's content for gallery and, if present, return the first
4768   *
4769   * @since 3.6.0
4770   *
4771   * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global $post.
4772   * @param bool        $html Optional. Whether to return HTML or data. Default is true.
4773   * @return string|array Gallery data and srcs parsed from the expanded shortcode.
4774   */
4775  function get_post_gallery( $post = 0, $html = true ) {
4776      $galleries = get_post_galleries( $post, $html );
4777      $gallery   = reset( $galleries );
4778  
4779      /**
4780       * Filters the first-found post gallery.
4781       *
4782       * @since 3.6.0
4783       *
4784       * @param array       $gallery   The first-found post gallery.
4785       * @param int|WP_Post $post      Post ID or object.
4786       * @param array       $galleries Associative array of all found post galleries.
4787       */
4788      return apply_filters( 'get_post_gallery', $gallery, $post, $galleries );
4789  }
4790  
4791  /**
4792   * Retrieve the image srcs from galleries from a post's content, if present
4793   *
4794   * @since 3.6.0
4795   *
4796   * @see get_post_galleries()
4797   *
4798   * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
4799   * @return array A list of lists, each containing image srcs parsed.
4800   *               from an expanded shortcode
4801   */
4802  function get_post_galleries_images( $post = 0 ) {
4803      $galleries = get_post_galleries( $post, false );
4804      return wp_list_pluck( $galleries, 'src' );
4805  }
4806  
4807  /**
4808   * Checks a post's content for galleries and return the image srcs for the first found gallery
4809   *
4810   * @since 3.6.0
4811   *
4812   * @see get_post_gallery()
4813   *
4814   * @param int|WP_Post $post Optional. Post ID or WP_Post object. Default is global `$post`.
4815   * @return string[] A list of a gallery's image srcs in order.
4816   */
4817  function get_post_gallery_images( $post = 0 ) {
4818      $gallery = get_post_gallery( $post, false );
4819      return empty( $gallery['src'] ) ? array() : $gallery['src'];
4820  }
4821  
4822  /**
4823   * Maybe attempts to generate attachment metadata, if missing.
4824   *
4825   * @since 3.9.0
4826   *
4827   * @param WP_Post $attachment Attachment object.
4828   */
4829  function wp_maybe_generate_attachment_metadata( $attachment ) {
4830      if ( empty( $attachment ) || empty( $attachment->ID ) ) {
4831          return;
4832      }
4833  
4834      $attachment_id = (int) $attachment->ID;
4835      $file          = get_attached_file( $attachment_id );
4836      $meta          = wp_get_attachment_metadata( $attachment_id );
4837  
4838      if ( empty( $meta ) && file_exists( $file ) ) {
4839          $_meta = get_post_meta( $attachment_id );
4840          $_lock = 'wp_generating_att_' . $attachment_id;
4841  
4842          if ( ! array_key_exists( '_wp_attachment_metadata', $_meta ) && ! get_transient( $_lock ) ) {
4843              set_transient( $_lock, $file );
4844              wp_update_attachment_metadata( $attachment_id, wp_generate_attachment_metadata( $attachment_id, $file ) );
4845              delete_transient( $_lock );
4846          }
4847      }
4848  }
4849  
4850  /**
4851   * Tries to convert an attachment URL into a post ID.
4852   *
4853   * @since 4.0.0
4854   *
4855   * @global wpdb $wpdb WordPress database abstraction object.
4856   *
4857   * @param string $url The URL to resolve.
4858   * @return int The found post ID, or 0 on failure.
4859   */
4860  function attachment_url_to_postid( $url ) {
4861      global $wpdb;
4862  
4863      $dir  = wp_get_upload_dir();
4864      $path = $url;
4865  
4866      $site_url   = parse_url( $dir['url'] );
4867      $image_path = parse_url( $path );
4868  
4869      // Force the protocols to match if needed.
4870      if ( isset(