作为一名后端研发，工作中避免不了的是与前端进行接口交互，有时候传的是json格式的数据，之前传的json数据也都是比较简单的格式，只有一层key-value，这次中有好多层的数据，校验起来相当麻烦，问了同事也没有好的解决办法。后来在网上查找资料发下有了灵丹妙药。就是今天要介绍的justinrainbow/json-schema，github地址。

下面介绍下用法，先上代码：
需要一个模板文件，格式为json，里面定义了数据的属性和类型，类似许多框架的校验类。

<?php 
$tmp = [
    "type" => "object",
    "properties" => [
        "index_page" => [
            "type" => "object",
            "properties" => [
                "tpl_no" => [
                    "type" => "integer"
                ],
                "primary_vision" => ['type' => "string"],
                "coupon_pic" => ['type' => "string"],
                "fetch_button" => [
                    "type" => "object",
                    "properties" => [
                        "text" => ['type' => "string"],
                        "text_color" => ['type' => "string"],
                        "color" => ['type' => "string"],
                    ]
                ],
                "bg_color" => ['type' => "string"],
                "page_text_color" => ['type' => "string"],
                "slide" => [
                    "type" => "array",
                    "minItems" => 1,
                    "items" => [
                        "type" => "object",
                        "properties" => [
                            "url" => ["type" => "string"],
                            "router" => ["type" => "string"],
                        ],
                        "required" => ['url', 'router']
                    ]

                ],
                "logo" => ["type" => "string"],
            ],
            "required"=>['tpl_no',"primary_vision","coupon_pic","fetch_button","bg_color","page_text_color","slide","logo"]
        ],
        "copywriting" => [
            "type" => "object",
            "properties" => [
                "share_pic" => ['type' => "string"],
                "index_share_title" => ['type' => "string"],
                "index_share_desc" => ['type' => "string"],
                "rule" => ['type' => "string"],
            ],
            "required"=>['share_pic',"index_share_title","index_share_desc","rule"]
        ],
        "submit" => ['type' => "string"],
        "activity_code" => ['type' => "string"],
        "email_prefix" => ['type' => "string"]
    ],
    "required"=>['index_page',"copywriting","activity_code","email_prefix"]
];
$tmp = json_encode($tmp);

$data = '{"index_page":{"tpl_no":1,"primary_vision":"http://10.16.34.42:8080/group3/M00/10/91/ChAiKlyYTXiAAdpnAAEDFxTmJWw032.jpg","coupon_pic":"http://10.16.34.42:8080/group3/M00/10/91/ChAiKlyYTXuAYaFqAAEDFxTmJWw580.jpg","fetch_button":{"text":"立即领取","text_color":"#fff","color":"#ff961e"},"bg_color":"#3d4347","rule_color":"#ccc","slide":[{"url":"http://10.16.34.42:8080/group3/M00/10/91/ChAiKlyYTZ6AbiWEAAEDFxTmJWw983.jpg","router":"123"}],"logo":"http://10.16.34.46:8080/group2/M00/16/EE/ChAiLlyYTbmARJh1AAEDFxTmJWw337.jpg"},"copywriting":{"share_pic":"http://10.16.34.46:8080/group2/M00/16/EE/ChAiLlyYTaaAfZcMAAEDFxTmJWw903.jpg","index_share_title":"122","index_share_desc":"11","rule":"<p>s<span style=\"font-weight: bold;\">assssfgsssssss啧啧啧</span></p>"},"submit":"1","activity_code":"rentLuckyCoupon","email_prefix":"ac"}';

require __DIR__ . '/../vendor/autoload.php';

$data = json_decode($data);

// Validate
$validator = new JsonSchema\Validator();
$validator->check($data, json_decode($tmp));

if ($validator->isValid()) {
    echo "The supplied JSON validates against the schema.\n";
} else {
    echo "JSON does not validate. Violations:\n";
    foreach ($validator->getErrors() as $error) {
        echo sprintf("[%s] %s\n", $error['property'], $error['message']);
    }
}

上面就也可以校验json的结构了，方便了好多。目前仅用到了上面的功能，并不能过滤掉不需要的结构，更多的功能请参考文档。

https://json-schema.org/understanding-json-schema/reference/object.html
https://github.com/justinrainbow/json-schema