为什么不编写一个普通的php数组，并在将其存储到数据库之前使用json\u encode（）函数来处理业务逻辑呢？
你可以在这里玩代码

$php_array = array(
    "1" => array(
                "name"  => "test item 1",
                "qty"   => 1,
                "price" => 1.99,
                "desc"  => "test desc"
        ),
    "2" => array(
                "name"  => "test item 2",
                "qty"   => 1,
                "price" => 1.99,
                "desc"  => "test desc 2"

        )
);

foreach($php_array as $arr){
    foreach($arr as $level_two){
        echo $level_two; 
    }
}

$json_array = json_encode($php_array);