比较2个json字符串以找到新的条目

I am trying to compare 2 json strings with each other to find all new entries in the list.

我正在尝试比较两个json字符串，以找到列表中的所有新条目。

This is how I am comparing them:

这就是我比较它们的方式:

$json = json_decode(file_get_contents("new.json"), true);
$last_json = json_decode(file_get_contents("last.json"), true);
$difference = array_diff($json, $last_json);

print_r($difference);

I am expecting it to return an array with all new entries. However, I am just getting an empty array in return.

我期望它返回一个包含所有新条目的数组。然而，我只是得到一个空数组作为回报。

Any help would be appreciated!

如有任何帮助，我们将不胜感激!

Additional information: I am also trying to compare the values of the arrays. This is how I'm trying to do that:

附加信息:我还试图比较数组的值。我就是这么做的:

foreach($json["whitelist_name"] AS $json_key => $json_val) {
        foreach($last_json["whitelist_name"] AS $last_json_key => $last_json_val) {
            if($json["whitelist_name"] != $last_json["whitelist_name"]) {
                echo $json["whitelist_name"];
            }
        }
    }

However, it seems that $json["whitelist_name"] is undefined

然而，$json[“whitelist_name”]似乎没有定义

1 个解决方案

#1

array_diff_assoc is the way to get difference of associative arrays:

array_diff_assoc是得到关联数组差异的方法:

$json = json_decode(file_get_contents("new.json"), true);
$last_json = json_decode(file_get_contents("last.json"), true);
$difference = array_diff_assoc($json, $last_json);

print_r($difference);

This small piece of code will find out if any whitelist_name is different in the new json than the old one

这一小段代码将会发现任何whitelist_name在新的json中是否与旧的不同

foreach($last_json as $key=>$value){
    if($value['whitelist_name'] != $json[$key]['whitelist_name']){
        // value is changed
    }else{
        // value is not changed
    }
}

#1