[Solved] Curl is not giving response in PHP [duplicate]

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To get more info regarding the error, you can use below code. 

   $responseInfo    = curl_getinfo($ch);
   $header_size    = curl_getinfo($ch, CURLINFO_HEADER_SIZE); 
   $responseHeader = substr($result, 0, $header_size);
   $responseBody   = substr($result, $header_size);

    echo 'Header: <br>'. $responseHeader;
    echo 'Body: <br>'. $responseBody;

Please check this 

$responseInfo['http_code'] -> gives the http response code.

Or

If you are not sure how to debug, then please use some libraries which would help you.
ZendService_Google_Gcm

Quick reference of gcm response codes

You can handle like this
https://github.com/zendframework/ZendService_Google_Gcm/blob/master/library/ZendService/Google/Gcm/Client.php#L116

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solved Curl is not giving response in PHP [duplicate]