Send push notification through Apple Push Notification Service (APNS)

apns-http2.php

<?php
$token = "<device-token>";
$message = array(
  'aps' => array(
    'alert' => 'hi there', 
    'badge' => 1, 
    'sound' => 'default'
  )
);

$ch = curl_init();
curl_setopt($ch, CURLOPT_HTTP_VERSION, 3);
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
curl_setopt($ch, CURLOPT_URL, 'https://api.push.apple.com/3/device/' . $token);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($message));
curl_setopt($ch, CURLOPT_HTTPHEADER, array("apns-topic: com.pleio.pleioapp"));
curl_setopt($ch, CURLOPT_SSLCERT, 'apns.crt'); // a file containing with the certificate and the private key concatinated

$response = curl_exec($ch);