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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 |
|---|---|
| 1200 | |
| 1201 | /** |
| 1202 | * Filter the Walker class used when adding nav menu items. |
| 1203 | * |
| 1204 | * @since 3.0.0 |
| 1205 | * |
| 1206 | * @param string $class The walker class to use. Default 'Walker_Nav_Menu_Edit'. |
| 1207 | * @param int $menu_id ID of the menu being rendered. |
| 1208 | */ |
| 1209 | $walker_class_name = apply_filters( 'wp_edit_nav_menu_walker', 'Walker_Nav_Menu_Edit', $menu_id ); |
| 1210 | |
| 1211 | if ( class_exists( $walker_class_name ) ) |
| 1212 | $walker = new $walker_class_name; |
| 1213 | else |
| 1214 | return new WP_Error( 'menu_walker_not_exist', sprintf( __('The Walker class named <strong>%s</strong> does not exist.'), $walker_class_name ) ); |
| 1215 | |
| 1216 | $some_pending_menu_items = $some_invalid_menu_items = false; |
| 1217 | foreach( (array) $menu_items as $menu_item ) { |
| 1218 | if ( isset( $menu_item->post_status ) && 'draft' == $menu_item->post_status ) |