php JSON管理：从解码的JSON对象中获取值

Question

I'm building a script to verify a transaction receipt with Apple's itunesconnect site (iphone dev) and I can't figure out where's the error in my code. I want to get the "status" value.

Please help me to find what am I doing wrong:

 <?php
    include("config.php");

    $receipt = json_encode(array("receipt-data" => $_GET["receipt"]));
    $response_json = do_post_request($url, $receipt);
    $response = json_decode($response_json);

    //Here's where I try to get the "status" key but doesn't work

    echo $response['status']; 
    //echo $response->status; 

    function do_post_request($url, $data)
    {
       //initialize cURL
     $ch = curl_init();

     // set the target url
     curl_setopt($ch, CURLOPT_URL,$url);

     // howmany parameter to post
     curl_setopt($ch, CURLOPT_POST, 1);

     // the receipt as parameter
     curl_setopt($ch, CURLOPT_POSTFIELDS,$data);

     $result= curl_exec ($ch);
     curl_close ($ch);
     return $result;
    }

    ?>

and the answer to the iPhone looks like:

{"receipt":{"item_id":"327931059", "original_transaction_id":"1000000000074412", "bvrs":"1.0", "product_id":"sandy_01", "purchase_date":"2009-09-29 16:12:46 Etc/GMT", "quantity":"1", "bid":"com.latin3g.chicasexy1", "original_purchase_date":"2009-09-29 16:12:46 Etc/GMT", "transaction_id":"1000000000074412"}, "status":0}

but only "status":0 matters for now - Thank's

Answer 1

From the manual on json_decode()

Returns an object or if the optional assoc parameter is TRUE, an associative array is instead returned. NULL is returned if the json cannot be decoded or if the encoded data is deeper than the recursion limit.

So either send TRUE for the 2nd parameter

$response = json_decode($response_json, true);

Or access the decoded JSON with object syntax

$response->status; 

EDIT

Isolated test

$json = <<<JSON
{"receipt":{"item_id":"327931059", "original_transaction_id":"1000000000074412", "bvrs":"1.0", "product_id":"sandy_01", "purchase_date":"2009-09-29 16:12:46 Etc/GMT", "quantity":"1", "bid":"com.latin3g.chicasexy1", "original_purchase_date":"2009-09-29 16:12:46 Etc/GMT", "transaction_id":"1000000000074412"}, "status":0}
JSON;

$response = json_decode( $json );

echo $response->status;

$response2 = json_decode( $json, true );

echo $response2['status'];

Output is

00