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我一直在为一个班级项目与实时 instagram api 搏斗。我有一个订阅和回调脚本，可以将数据推送到 mongoDB。一切都很好，我收到了更新，但是 $data 数组在所有这些上都是空的。我似乎无法找到为什么我没有收到更新后的数据。任何帮助，将不胜感激。这是我的代码，我附上了我的 mongoDB 结果的屏幕截图。

***订阅脚本

<?php
//Subscribe

//ALL YOUR IMPORTANT API INFO
$client_id = 'xxxxxxxxxxxxxxxxxxxx';
$client_secret = 'xxxxxxxxxxxxxxxxxxxxxx';
$object = 'geography';
$lat = '39.73';
$lng = '-104.98';
$radius = '5000';
$aspect = 'media';
$verify_token='';
$callback_url = 'http://www.callback.com';


//SETTING UP THE CURL SETTINGS

$attachment =  array(
'client_id' => $client_id,
'client_secret' => $client_secret,
'object' => $object,
'lat' => $lat,
'lng' => $lng,
'radius' => $radius,
'aspect' => $aspect,
'verify_token' => $verify_token,
'callback_url'=>$callback_url
);

//URL TO THE INSTAGRAM API FUNCTION
$url = "https://api.instagram.com/v1/subscriptions/";

$ch = curl_init();

//EXECUTE THE CURL...
curl_setopt($ch, CURLOPT_URL,$url);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $attachment);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);  //to suppress the curl output 
$result = curl_exec($ch);
curl_close ($ch);

//PRINT THE RESULTS OF THE SUBSCRIPTION, IF ALL GOES WELL YOULL SEE A 200
print_r($result);


?>

* *回调脚本

<?php

//Callback

if (isset ($_GET['hub_challenge'])){
    echo $_GET['hub_challenge'];
}

else {
    //database config
    $dbhost = '@myserver';
    $dbname = 'test';

    //connect to database
    $m = new Mongo("mongodb://$dbhost");
    $db = $m->$dbname;

    //select the collection
    $collection = $db->instagram;

    //This is an update
    $myString = file_get_contents('php://input');
    $ALL = date("F j, Y, g:i a")." ".$myString."\r\n";
    file_put_contents('activity1.log', $ALL, FILE_APPEND);
    $answer = json_decode($myString);
    $collection->save($answer);
}
?>

当我打开 RoboMongo 时，我收到的键是对象 ID、更改的方面、对象、时间、订阅 ID。然后有一个始终为空的数据数组。我不知道如何从中获取信息。

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