php如何使用cookie存值

$data = array(
            'a'=>'aaa',
            'b'=>'bbb',
            'c'=>'ccc'
        );
        $str = $data['a'].",".$data['b'].",".$data['c'];  //拼接成字符串

        set_cookie('name',$str,3600);
        $cstr = $_COOKIE['name'];
        $cdata = split('[/,]',$cstr);

$data = array(
            'a'=>'aaa',
            'b'=>'bbb',
            'c'=>'ccc'
        );
        set_cookie('name',json_encode($data),time()+3600);

        $cstr = $_COOKIE['name'];
        $cdata = json_decode($cstr);