_deprecated_hook example

function apply_filters_deprecated( $hook_name, $args, $version, $replacement = '', $message = '' ) {
    if ( ! has_filter( $hook_name ) ) {
        return $args[0];
    }

    _deprecated_hook( $hook_name, $version, $replacement, $message );

    return apply_filters_ref_array( $hook_name, $args );
}

/** * Fires functions attached to a deprecated action hook. * * When an action hook is deprecated, the do_action() call is replaced with * do_action_deprecated(), which triggers a deprecation notice and then fires * the original hook. * * @since 4.6.0 * * @see _deprecated_hook() * * @param string $hook_name The name of the action hook. * @param array $args Array of additional function arguments to be passed to do_action(). * @param string $version The version of WordPress that deprecated the hook. * @param string $replacement Optional. The hook that should have been used. Default empty. * @param string $message Optional. A message regarding the change. Default empty. */