显示计数结果

Question

我想知道如何计算有多少人在Instagram上关注某人，并将数字放在一个变量中，Instagram给出了这个链接：

https://api.instagram.com/v1/users/3/followed-by?access_token=xxxxxxxxx.xxxxxxxxxxxxxxxxxxxx

并显示如下结果

{
    "data": [{
        "username": "meeker",
        "first_name": "Tom",
        "profile_picture": "http://distillery.s3.amazonaws.com/profiles/profile_6623_75sq.jpg",
        "id": "6623",
        "last_name": "Meeker"
    },
    {
        "username": "Mark",
        "first_name": "Mark",
        "profile_picture": "http://distillery.s3.amazonaws.com/profiles/profile_29648_75sq_1294520029.jpg",
        "id": "29648",
        "last_name": "Shin"
    },
    {
        "username": "nancy",
        "first_name": "Nancy",
        "profile_picture": "http://distillery.s3.amazonaws.com/profiles/profile_13096_75sq_1286441317.jpg",
        "id": "13096",
        "last_name": "Smith"
    }]
}

我如何计算有多少个，并将其放在一个var中，比如：

<? echo "You are been follow by ".$followers." users!"; ?>

显示:你被3个用户关注！

Answer 1

您需要使用json_decode来解码JSON响应，然后访问结果对象的数据属性(“follower”对象的数组)，并对其进行计数：

$json = '{
    "data": [{
        "username": "meeker",
        "first_name": "Tom",
        "profile_picture": "http://distillery.s3.amazonaws.com/profiles/profile_6623_75sq.jpg",
        "id": "6623",
        "last_name": "Meeker"
    },
    {
        "username": "Mark",
        "first_name": "Mark",
        "profile_picture": "http://distillery.s3.amazonaws.com/profiles/profile_29648_75sq_1294520029.jpg",
        "id": "29648",
        "last_name": "Shin"
    },
    {
        "username": "nancy",
        "first_name": "Nancy",
        "profile_picture": "http://distillery.s3.amazonaws.com/profiles/profile_13096_75sq_1286441317.jpg",
        "id": "13096",
        "last_name": "Smith"
    }]
}';
$json = json_decode($json);
echo "You have " .count($json->data) ." followers"

或

$json = json_decode($json,true);
echo "You have " .count($json['data']) ." followers"

Answer 2

你得到的是一个json字符串，你需要使用json_decode解码它。

$data = json_decode($string,true);
$followers = count($data['data']);

CodePad Demo。

Answer 3

使用json_decode()从JSON创建一个PHP数组。然后，您可以简单地对其执行count()：

$jsonData = json_decode($yourAPIResult);
echo count($jsonData->data);

但是，请注意，您可能应该设置一些错误处理，以防API没有返回正确的JSON字符串。所以像这样的东西可能更好：

if (is_null($jsonData) || !property_exists($jsonData, 'data')) {
   echo '?';
} else {
   echo count($jsonData->data);
}