Json的Key缺少＂

    function ext_json_decode($str, $mode=false){
        $str = str_replace("'","\"",$str);
        if(preg_match('/\w:/', $str)){
            $str = preg_replace('/(\w+):/is', '"$1":', $str);
        }
        return json_decode($str, $mode);
    }