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   1  <?php
   2  /**
   3   * Build Administration Menu.
   4   *
   5   * @package WordPress
   6   * @subpackage Administration
   7   */
   8  
   9  if ( is_network_admin() ) {
  10  
  11      /**
  12       * Fires before the administration menu loads in the Network Admin.
  13       *
  14       * The hook fires before menus and sub-menus are removed based on user privileges.
  15       *
  16       * @private
  17       * @since 3.1.0
  18       */
  19      do_action( '_network_admin_menu' );
  20  } elseif ( is_user_admin() ) {
  21  
  22      /**
  23       * Fires before the administration menu loads in the User Admin.
  24       *
  25       * The hook fires before menus and sub-menus are removed based on user privileges.
  26       *
  27       * @private
  28       * @since 3.1.0
  29       */
  30      do_action( '_user_admin_menu' );
  31  } else {
  32  
  33      /**
  34       * Fires before the administration menu loads in the admin.
  35       *
  36       * The hook fires before menus and sub-menus are removed based on user privileges.
  37       *
  38       * @private
  39       * @since 2.2.0
  40       */
  41      do_action( '_admin_menu' );
  42  }
  43  
  44  // Create list of page plugin hook names.
  45  foreach ( $menu as $menu_page ) {
  46      $pos = strpos( $menu_page[2], '?' );
  47      if ( false !== $pos ) {
  48          // Handle post_type=post|page|foo pages.
  49          $hook_name = substr( $menu_page[2], 0, $pos );
  50          $hook_args = substr( $menu_page[2], $pos + 1 );
  51          wp_parse_str( $hook_args, $hook_args );
  52          // Set the hook name to be the post type.
  53          if ( isset( $hook_args['post_type'] ) ) {
  54              $hook_name = $hook_args['post_type'];
  55          } else {
  56              $hook_name = basename( $hook_name, '.php' );
  57          }
  58          unset( $hook_args );
  59      } else {
  60          $hook_name = basename( $menu_page[2], '.php' );
  61      }
  62      $hook_name = sanitize_title( $hook_name );
  63  
  64      if ( isset( $compat[ $hook_name ] ) ) {
  65          $hook_name = $compat[ $hook_name ];
  66      } elseif ( ! $hook_name ) {
  67          continue;
  68      }
  69  
  70      $admin_page_hooks[ $menu_page[2] ] = $hook_name;
  71  }
  72  unset( $menu_page, $compat );
  73  
  74  $_wp_submenu_nopriv = array();
  75  $_wp_menu_nopriv    = array();
  76  // Loop over submenus and remove pages for which the user does not have privs.
  77  foreach ( $submenu as $parent => $sub ) {
  78      foreach ( $sub as $index => $data ) {
  79          if ( ! current_user_can( $data[1] ) ) {
  80              unset( $submenu[ $parent ][ $index ] );
  81              $_wp_submenu_nopriv[ $parent ][ $data[2] ] = true;
  82          }
  83      }
  84      unset( $index, $data );
  85  
  86      if ( empty( $submenu[ $parent ] ) ) {
  87          unset( $submenu[ $parent ] );
  88      }
  89  }
  90  unset( $sub, $parent );
  91  
  92  /*
  93   * Loop over the top-level menu.
  94   * Menus for which the original parent is not accessible due to lack of privileges
  95   * will have the next submenu in line be assigned as the new menu parent.
  96   */
  97  foreach ( $menu as $id => $data ) {
  98      if ( empty( $submenu[ $data[2] ] ) ) {
  99          continue;
 100      }
 101      $subs       = $submenu[ $data[2] ];
 102      $first_sub  = reset( $subs );
 103      $old_parent = $data[2];
 104      $new_parent = $first_sub[2];
 105      /*
 106       * If the first submenu is not the same as the assigned parent,
 107       * make the first submenu the new parent.
 108       */
 109      if ( $new_parent != $old_parent ) {
 110          $_wp_real_parent_file[ $old_parent ] = $new_parent;
 111          $menu[ $id ][2]                      = $new_parent;
 112  
 113          foreach ( $submenu[ $old_parent ] as $index => $data ) {
 114              $submenu[ $new_parent ][ $index ] = $submenu[ $old_parent ][ $index ];
 115              unset( $submenu[ $old_parent ][ $index ] );
 116          }
 117          unset( $submenu[ $old_parent ], $index );
 118  
 119          if ( isset( $_wp_submenu_nopriv[ $old_parent ] ) ) {
 120              $_wp_submenu_nopriv[ $new_parent ] = $_wp_submenu_nopriv[ $old_parent ];
 121          }
 122      }
 123  }
 124  unset( $id, $data, $subs, $first_sub, $old_parent, $new_parent );
 125  
 126  if ( is_network_admin() ) {
 127  
 128      /**
 129       * Fires before the administration menu loads in the Network Admin.
 130       *
 131       * @since 3.1.0
 132       *
 133       * @param string $context Empty context.
 134       */
 135      do_action( 'network_admin_menu', '' );
 136  } elseif ( is_user_admin() ) {
 137  
 138      /**
 139       * Fires before the administration menu loads in the User Admin.
 140       *
 141       * @since 3.1.0
 142       *
 143       * @param string $context Empty context.
 144       */
 145      do_action( 'user_admin_menu', '' );
 146  } else {
 147  
 148      /**
 149       * Fires before the administration menu loads in the admin.
 150       *
 151       * @since 1.5.0
 152       *
 153       * @param string $context Empty context.
 154       */
 155      do_action( 'admin_menu', '' );
 156  }
 157  
 158  /*
 159   * Remove menus that have no accessible submenus and require privileges
 160   * that the user does not have. Run re-parent loop again.
 161   */
 162  foreach ( $menu as $id => $data ) {
 163      if ( ! current_user_can( $data[1] ) ) {
 164          $_wp_menu_nopriv[ $data[2] ] = true;
 165      }
 166  
 167      /*
 168       * If there is only one submenu and it is has same destination as the parent,
 169       * remove the submenu.
 170       */
 171      if ( ! empty( $submenu[ $data[2] ] ) && 1 === count( $submenu[ $data[2] ] ) ) {
 172          $subs      = $submenu[ $data[2] ];
 173          $first_sub = reset( $subs );
 174          if ( $data[2] == $first_sub[2] ) {
 175              unset( $submenu[ $data[2] ] );
 176          }
 177      }
 178  
 179      // If submenu is empty...
 180      if ( empty( $submenu[ $data[2] ] ) ) {
 181          // And user doesn't have privs, remove menu.
 182          if ( isset( $_wp_menu_nopriv[ $data[2] ] ) ) {
 183              unset( $menu[ $id ] );
 184          }
 185      }
 186  }
 187  unset( $id, $data, $subs, $first_sub );
 188  
 189  /**
 190   * Adds a CSS class to a string.
 191   *
 192   * @since 2.7.0
 193   *
 194   * @param string $class_to_add The CSS class to add.
 195   * @param string $classes      The string to add the CSS class to.
 196   * @return string The string with the CSS class added.
 197   */
 198  function add_cssclass( $class_to_add, $classes ) {
 199      if ( empty( $classes ) ) {
 200          return $class_to_add;
 201      }
 202  
 203      return $classes . ' ' . $class_to_add;
 204  }
 205  
 206  /**
 207   * Adds CSS classes for top-level administration menu items.
 208   *
 209   * The list of added classes includes `.menu-top-first` and `.menu-top-last`.
 210   *
 211   * @since 2.7.0
 212   *
 213   * @param array $menu The array of administration menu items.
 214   * @return array The array of administration menu items with the CSS classes added.
 215   */
 216  function add_menu_classes( $menu ) {
 217      $first_item  = false;
 218      $last_order  = false;
 219      $items_count = count( $menu );
 220      $i           = 0;
 221  
 222      foreach ( $menu as $order => $top ) {
 223          $i++;
 224  
 225          if ( 0 == $order ) { // Dashboard is always shown/single.
 226              $menu[0][4] = add_cssclass( 'menu-top-first', $top[4] );
 227              $last_order = 0;
 228              continue;
 229          }
 230  
 231          if ( 0 === strpos( $top[2], 'separator' ) && false !== $last_order ) { // If separator.
 232              $first_item             = true;
 233              $classes                = $menu[ $last_order ][4];
 234              $menu[ $last_order ][4] = add_cssclass( 'menu-top-last', $classes );
 235              continue;
 236          }
 237  
 238          if ( $first_item ) {
 239              $classes           = $menu[ $order ][4];
 240              $menu[ $order ][4] = add_cssclass( 'menu-top-first', $classes );
 241              $first_item        = false;
 242          }
 243  
 244          if ( $i == $items_count ) { // Last item.
 245              $classes           = $menu[ $order ][4];
 246              $menu[ $order ][4] = add_cssclass( 'menu-top-last', $classes );
 247          }
 248  
 249          $last_order = $order;
 250      }
 251  
 252      /**
 253       * Filters administration menu array with classes added for top-level items.
 254       *
 255       * @since 2.7.0
 256       *
 257       * @param array $menu Associative array of administration menu items.
 258       */
 259      return apply_filters( 'add_menu_classes', $menu );
 260  }
 261  
 262  uksort( $menu, 'strnatcasecmp' ); // Make it all pretty.
 263  
 264  /**
 265   * Filters whether to enable custom ordering of the administration menu.
 266   *
 267   * See the {@see 'menu_order'} filter for reordering menu items.
 268   *
 269   * @since 2.8.0
 270   *
 271   * @param bool $custom Whether custom ordering is enabled. Default false.
 272   */
 273  if ( apply_filters( 'custom_menu_order', false ) ) {
 274      $menu_order = array();
 275      foreach ( $menu as $menu_item ) {
 276          $menu_order[] = $menu_item[2];
 277      }
 278      unset( $menu_item );
 279      $default_menu_order = $menu_order;
 280  
 281      /**
 282       * Filters the order of administration menu items.
 283       *
 284       * A truthy value must first be passed to the {@see 'custom_menu_order'} filter
 285       * for this filter to work. Use the following to enable custom menu ordering:
 286       *
 287       *     add_filter( 'custom_menu_order', '__return_true' );
 288       *
 289       * @since 2.8.0
 290       *
 291       * @param array $menu_order An ordered array of menu items.
 292       */
 293      $menu_order         = apply_filters( 'menu_order', $menu_order );
 294      $menu_order         = array_flip( $menu_order );
 295      $default_menu_order = array_flip( $default_menu_order );
 296  
 297      /**
 298       * @global array $menu_order
 299       * @global array $default_menu_order
 300       *
 301       * @param array $a
 302       * @param array $b
 303       * @return int
 304       */
 305  	function sort_menu( $a, $b ) {
 306          global $menu_order, $default_menu_order;
 307          $a = $a[2];
 308          $b = $b[2];
 309          if ( isset( $menu_order[ $a ] ) && ! isset( $menu_order[ $b ] ) ) {
 310              return -1;
 311          } elseif ( ! isset( $menu_order[ $a ] ) && isset( $menu_order[ $b ] ) ) {
 312              return 1;
 313          } elseif ( isset( $menu_order[ $a ] ) && isset( $menu_order[ $b ] ) ) {
 314              if ( $menu_order[ $a ] == $menu_order[ $b ] ) {
 315                  return 0;
 316              }
 317              return ( $menu_order[ $a ] < $menu_order[ $b ] ) ? -1 : 1;
 318          } else {
 319              return ( $default_menu_order[ $a ] <= $default_menu_order[ $b ] ) ? -1 : 1;
 320          }
 321      }
 322  
 323      usort( $menu, 'sort_menu' );
 324      unset( $menu_order, $default_menu_order );
 325  }
 326  
 327  // Prevent adjacent separators.
 328  $prev_menu_was_separator = false;
 329  foreach ( $menu as $id => $data ) {
 330      if ( false === stristr( $data[4], 'wp-menu-separator' ) ) {
 331  
 332          // This item is not a separator, so falsey the toggler and do nothing.
 333          $prev_menu_was_separator = false;
 334      } else {
 335  
 336          // The previous item was a separator, so unset this one.
 337          if ( true === $prev_menu_was_separator ) {
 338              unset( $menu[ $id ] );
 339          }
 340  
 341          // This item is a separator, so truthy the toggler and move on.
 342          $prev_menu_was_separator = true;
 343      }
 344  }
 345  unset( $id, $data, $prev_menu_was_separator );
 346  
 347  // Remove the last menu item if it is a separator.
 348  $last_menu_key = array_keys( $menu );
 349  $last_menu_key = array_pop( $last_menu_key );
 350  if ( ! empty( $menu ) && 'wp-menu-separator' === $menu[ $last_menu_key ][4] ) {
 351      unset( $menu[ $last_menu_key ] );
 352  }
 353  unset( $last_menu_key );
 354  
 355  if ( ! user_can_access_admin_page() ) {
 356  
 357      /**
 358       * Fires when access to an admin page is denied.
 359       *
 360       * @since 2.5.0
 361       */
 362      do_action( 'admin_page_access_denied' );
 363  
 364      wp_die( __( 'Sorry, you are not allowed to access this page.' ), 403 );
 365  }
 366  
 367  $menu = add_menu_classes( $menu );