Unable to send push notification to ios using php - php

Question

I am trying to send a push notification to IOS using php and Yii framework. I created a function as follows to get data and send notification. $data is an array which contains a message and an array inside to keep registration IDs (device tokens). I ran it on my localhost but notification is not sent to my device. By the way, the output of my function is an integer value and I cannot recognize if the message has been sent or what!?
Is there anything wrong in my code?
private function _pushIOS($data)
{
// Create a connection
$apnsHost = $this->_notificationUrl;
$apnsPort = 2195;
$apnsCert = Yii::app()->controller->createUrl('/').'/my_certificate_dev.pem';
$streamContext = stream_context_create();
stream_context_set_option($streamContext, 'ssl', 'local_cert', $apnsCert);
$apns = stream_socket_client('ssl://' . $apnsHost . ':' . $apnsPort, $error, $errorString, 2, STREAM_CLIENT_CONNECT, $streamContext);
if (!$apns)
exit("Failed to connect: $error $errorString" . PHP_EOL);
foreach($data['registration_ids'] as $deviceToken) {
$body = array();
$body['aps'] = array(
'alert' => $data['data']['message'],
'badge' => 1,
'sound' => 'default'
);
// Encode the payload as JSON
$payload = json_encode($body);
// Build the binary notification
$apnsMessage = chr(0) . chr(0) . chr(32) . pack('H*', str_replace(' ', '', $deviceToken)) . chr(0) . chr(strlen($payload)) . $payload;
// Send it to the server
$result = fwrite($apns, $apnsMessage, strlen($apnsMessage));
}
// Close the socket and connection to the server
#socket_close($apns);
fclose($apns);
return json_decode($result);
}

Answer 1

Finally, I got the answer. The problem was with the pem file path. Absolute path must be passed to the function to work. The following line should be replaced:
$apnsCert = Yii::app()->controller->createUrl('/').'/my_certificate_dev.pem';
Correct path:
$apnsCert = dirname(Yii::app()->request->scriptFile).'/my_certificate_dev.pem';