json_decode 和 json_encode 区别

json_decode： json字符串转json对象
json_encode： json对象转json字符串


json对象：

{
    "id": 68,
    "order_no": "C615901108975467",
    "snap_items": [
        {
            "id": 1,
            "name": "芹菜 半斤",
        },
        {
            "id": 2,
            "name": "梨花带雨 3个",
        }
    ]
}

json字符串

{
    "id": 68,
    "order_no": "C615901108975467",
    "snap_items": "[
        {"id":1,"name":"\u82b9\u83dc \u534a\u65a4"},        
        {"id":2,"name":"\u68a8\u82b1\u5e26\u96e8 3\u4e2a"}
    ]",
}