Array delete

<?php

class Config {

    private $_config = array();

    public function delete ($name) {

        $name =& $this->_get_item($name);

        unset($name);

    }

    private function & _get_item ($name) {

        $config =& $this->_config;

        foreach (array_map("trim", explode(".", $name)) as $group) {

            if ( ! array_key_exists($group, $config) ) $config[$group] = array();

            $config =& $config[$group];

        }

        return $config;

    }

}