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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 |
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919 |
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920 | /** |
921 | * Filters the Walker class used when adding nav menu items. |
922 | * |
923 | * @since 3.0.0 |
924 | * |
925 | * @param string $class The walker class to use. Default 'Walker_Nav_Menu_Edit'. |
926 | * @param int $menu_id ID of the menu being rendered. |
927 | */ |
928 | $walker_class_name = apply_filters( 'wp_edit_nav_menu_walker', 'Walker_Nav_Menu_Edit', $menu_id ); |
929 |
|
930 | if ( class_exists( $walker_class_name ) ) { |
931 | $walker = new $walker_class_name; |
932 | } else { |
933 | return new WP_Error( 'menu_walker_not_exist', |
934 | /* translators: %s: walker class name */ |
935 | sprintf( __( 'The Walker class named %s does not exist.' ), |
936 | '<strong>' . $walker_class_name . '</strong>' |
937 | ) |