PHP獲取多級樹形菜單，無限極分類樹形菜單

level代表菜單級別，前端根據此控制縮進

pid  上級分類id

代碼

PHP 

查詢數據庫中所有菜單，進行排序

public function getCatalogTree()
    {
        $list = $this->select();
        return $this->sort($list);
    }

    public function sort($data, $pid = 0, $level = 0)
    {
        static $arr = array();
        foreach ($data as $k => $v) {
            if ($v['pid'] == $pid) {
                $v['level'] = $level;
                $arr[] = $v;
                $this->sort($data, $v['id'], $level + 1);
            }
        }
        return $arr;
    }

    /**
     * 縮進
     */
    function topString(level) {
        var str = '';
        for (var i=0; i<level; i++)
        {
            str += '|----';
        }
        return str;


    }