Ariadne-CMS / arc-base

     * @param  mixed          $nodeName The name of the 'name' property or a function that returns the name of a node.

     * @return array

     */

    public static function ls($node, $callback, $nodeName = 'nodeName')

    {

        $result = [];

        foreach ($node->childNodes as $child) {

            $name = self::getNodeName( $child, $nodeName );

            $result[ $name ] = call_user_func( $callback, $child );

        }

        return $result;

    }

    /**

     * Calls the callback method on each child of the current node, including the node itself, until a non-null

     * @param  mixed          $initial  The value to pass to the first callback call.

     * @return mixed

     */

    public static function reduce($node, $callback, $initial = null)

    {

        $result = call_user_func( $callback, $initial, $node );

        foreach ($node->childNodes as $child) {

            $result = self::reduce( $child, $callback, $result );

        }

        return $result;

    }

    /**

     * Filters the tree using a callback method. If the callback method returns true, the node's value is included