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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 1131 | $menu_items = wp_get_nav_menu_items( $menu->term_id, array('post_status' => 'any') ); |
| 1132 | $result = '<div id="menu-instructions" class="post-body-plain'; |
| 1133 | $result .= ( ! empty($menu_items) ) ? ' menu-instructions-inactive">' : '">'; |
| 1134 | $result .= '<p>' . __( 'Add menu items from the column on the left.' ) . '</p>'; |
| 1135 | $result .= '</div>'; |
| 1136 | |
| 1137 | if( empty($menu_items) ) |
| 1138 | return $result . ' <ul class="menu" id="menu-to-edit"> </ul>'; |
| 1139 | |
| 1140 | $walker_class_name = apply_filters( 'wp_edit_nav_menu_walker', 'Walker_Nav_Menu_Edit', $menu_id ); |
| 1141 | |
| 1142 | if ( class_exists( $walker_class_name ) ) |
| 1143 | $walker = new $walker_class_name; |
| 1144 | else |
| 1145 | return new WP_Error( 'menu_walker_not_exist', sprintf( __('The Walker class named <strong>%s</strong> does not exist.'), $walker_class_name ) ); |
| 1146 | |
| 1147 | $some_pending_menu_items = $some_invalid_menu_items = false; |
| 1148 | foreach( (array) $menu_items as $menu_item ) { |
| 1149 | if ( isset( $menu_item->post_status ) && 'draft' == $menu_item->post_status ) |