Config delete

<?php

class Config {

    public function delete ($name) {

       if ( strrpos($name, '.') !== FALSE ) {

           $index = strrpos($name, '.');

           $item  = substr($name, $index+1);
           $group = substr($name, 0, $index);
           $group =& $this->_get_item($group);

           unset ($group[$item]);

       } else {

           unset ($this->_config[$name]);

       }

    }

}