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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 |
|---|---|
| 891 | |
| 892 | /** |
| 893 | * Filter the Walker class used when adding nav menu items. |
| 894 | * |
| 895 | * @since 3.0.0 |
| 896 | * |
| 897 | * @param string $class The walker class to use. Default 'Walker_Nav_Menu_Edit'. |
| 898 | * @param int $menu_id ID of the menu being rendered. |
| 899 | */ |
| 900 | $walker_class_name = apply_filters( 'wp_edit_nav_menu_walker', 'Walker_Nav_Menu_Edit', $menu_id ); |
| 901 | |
| 902 | if ( class_exists( $walker_class_name ) ) { |
| 903 | $walker = new $walker_class_name; |
| 904 | } else { |
| 905 | return new WP_Error( 'menu_walker_not_exist', |
| 906 | /* translators: %s: walker class name */ |
| 907 | sprintf( __( 'The Walker class named %s does not exist.' ), |
| 908 | '<strong>' . $walker_class_name . '</strong>' |
| 909 | ) |