function register_sidebar_widget($name, $output_callback, $classname = '') {}

Register widget for sidebar with backwards compatibility.
Allows $name to be an array that accepts either three elements to grab the first element and the third for the name or just uses the first element of the array for the name.


  • string|int $name: Widget ID.
  • callback $output_callback: Run when widget is called.
  • string $classname: Classname widget option.
  • mixed $params,…: Widget parameters.

Source code

function register_sidebar_widget($name, $output_callback, $classname = '') {

	_deprecated_function( __FUNCTION__, '2.8', 'wp_register_sidebar_widget()' );

	// Compat

	if ( is_array($name) ) {

		if ( count($name) == 3 )

			$name = sprintf($name[0], $name[2]);


			$name = $name[0];


	$id = sanitize_title($name);

	$options = array();

	if ( !empty($classname) && is_string($classname) )

		$options['classname'] = $classname;

	$params = array_slice(func_get_args(), 2);

	$args = array($id, $name, $output_callback, $options);

	if ( !empty($params) )

		$args = array_merge($args, $params);

	call_user_func_array('wp_register_sidebar_widget', $args);



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