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if(!function_exists('treeList')) {
    /**
     * Ê÷ÐÎÁбí
     * @author lulijuan
     * @param $data
     * @param int $level
     * @return array
     */
    function treeList($list, $pk='id', $pid = 'parent_id', $child = 'items', $root = 0) {
        // ´´½¨Tree
        $tree = array();
        if(is_array($list)) {
            // ´´½¨»ùÓÚÖ÷¼üµÄÊý×éÒýÓÃ
            $refer = array();
            foreach ($list as $key => $data) {
                $refer[$data[$pk]] =& $list[$key];
            }

            foreach ($list as $key => $data) {
                // ÅжÏÊÇ·ñ´æÔÚparent
                $parentId =  $data[$pid];
                if ($root == $parentId) {
                    $tree[] =& $list[$key];
                }else{
                    if (isset($refer[$parentId])) {
                        $parent =& $refer[$parentId];
                        $parent[$child][] =& $list[$key];
                    }
                }
            }
        }
        return $tree;
    }
}