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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 |
|---|---|
| 1173 | |
| 1174 | /** |
| 1175 | * Filter the Walker class used to render a menu formatted for editing. |
| 1176 | * |
| 1177 | * @since 3.0.0 |
| 1178 | * |
| 1179 | * @param string $walker_class_name The Walker class used to render a menu formatted for editing. |
| 1180 | * @param int $menu_id The ID of the menu being rendered. |
| 1181 | */ |
| 1182 | $walker_class_name = apply_filters( 'wp_edit_nav_menu_walker', 'Walker_Nav_Menu_Edit', $menu_id ); |
| 1183 | |
| 1184 | if ( class_exists( $walker_class_name ) ) |
| 1185 | $walker = new $walker_class_name; |
| 1186 | else |
| 1187 | return new WP_Error( 'menu_walker_not_exist', sprintf( __('The Walker class named <strong>%s</strong> does not exist.'), $walker_class_name ) ); |
| 1188 | |
| 1189 | $some_pending_menu_items = $some_invalid_menu_items = false; |
| 1190 | foreach( (array) $menu_items as $menu_item ) { |
| 1191 | if ( isset( $menu_item->post_status ) && 'draft' == $menu_item->post_status ) |