Simple PHP script to send Android Push Notification, iOS Push Notification and Windows Phone 8 Push Notification

PushNotifications.php

<?php
// Server file
class PushNotifications
{

	// (Android)API access key from Google API's Console.
	private static $API_ACCESS_KEY = 'AIzaSyDG3fYAXXXXX-XXXXXJyJXiO5JagAsYI';
	// (iOS) Private key's passphrase.
	private static $passphrase = 'joashp';
	// (Windows Phone 8) The name of our push channel.
        private static $channelName = "joashp";

	// Change the above three vriables as per your app.

	public function __construct() {
		exit('Init function is not allowed');
	}

        // Sends Push notification for Android users
	public static function android($data, $reg_id) {
	        $url = 'https://android.googleapis.com/gcm/send';
	        $message = array(
	            'title' => $data['mtitle'],
	            'message' => $data['mdesc'],
	            'subtitle' => '',
	            'tickerText' => '',
	            'msgcnt' => 1,
	            'vibrate' => 1
	        );

	        $headers = array(
	        	'Authorization: key=' .self::$API_ACCESS_KEY,
	        	'Content-Type: application/json'
	        );

	        $fields = array(
	            'registration_ids' => $reg_id,
	            'data' => $message,
	        );

	    	return self::useCurl($url, $headers, json_encode($fields));
    	}

	// Sends Push's toast notification for Windows Phone 8 users
	public static function WP($data, $uri) {
		$delay = 2;
		$msg =  "<?xml version=\"1.0\" encoding=\"utf-8\"?>" .
		        "<wp:Notification xmlns:wp=\"WPNotification\">" .
		            "<wp:Toast>" .
		                "<wp:Text1>".htmlspecialchars($data['mtitle'])."</wp:Text1>" .
		                "<wp:Text2>".htmlspecialchars($data['mdesc'])."</wp:Text2>" .
		            "</wp:Toast>" .
		        "</wp:Notification>";

		$sendedheaders =  array(
		    'Content-Type: text/xml',
		    'Accept: application/*',
		    'X-WindowsPhone-Target: toast',
		    "X-NotificationClass: $delay"
		);

		$response = self::useCurl($uri, $sendedheaders, $msg);

		$result = array();
		foreach(explode("\n", $response) as $line) {
		    $tab = explode(":", $line, 2);
		    if (count($tab) == 2)
		        $result[$tab[0]] = trim($tab[1]);
		}

		return $result;
	}

    public static function iOS($data, $deviceTokens)
    {
        if(Api::SANDBOX==true)
        {
            $applePushGateway="ssl://gateway.sandbox.push.apple.com:2195";
            $ckpem="ck_sandbox.pem";
        }

        else
        {
            $applePushGateway="ssl://gateway.push.apple.com:2195";
            $ckpem="ck_production.pem";
        }

        $ctx = stream_context_create();
	// ck.pem is your certificate file
	stream_context_set_option($ctx, 'ssl', 'local_cert', $ckpem); //PUT THIS .pem file IN A DIRECTORY WHERE YOU EXECUTE TestNotifications.php
	stream_context_set_option($ctx, 'ssl', 'passphrase', self::$passphrase);

	// Open a connection to the APNS server
	$fp = stream_socket_client(
		$applePushGateway, $err,
		$errstr, 60, STREAM_CLIENT_CONNECT|STREAM_CLIENT_PERSISTENT, $ctx);

	if (!$fp)
        {
            return false;
	    exit("Failed to connect: $err $errstr" . PHP_EOL);
        }

		// Create the payload body
	$body['aps'] =
        [
		'alert' =>
            	[
	    		'title' => $data['title'],
                	'body' => $data['body'],
		],
		'sound' =>  $data['sound'],
	];

        //only if badge is set, send it
        if(isset($data['badge']))
            $body['aps']['badge']=(int)$data['badge'];


	// Encode the payload as JSON
	$payload = json_encode($body);

        //if you have multiple tokens for one user or if you want to send notifications to more user take all the tokens you need and put in array and use foreach to send notification, this way is faster because connection to apple server is  opened during sending
        foreach($deviceTokens as $deviceToken)
        {
    		// Build the binary notification
    		$msg = chr(0).pack('n', 32).pack('H*', $deviceToken).pack('n', strlen($payload)).$payload;

    		// Send it to the server
    		$result = fwrite($fp, $msg, strlen($msg));
        }

	// Close the connection to the server
	fclose($fp);

	if (!$result)
		return false; //return 'Message not delivered' . PHP_EOL;
	else
		return true; //return 'Message successfully delivered' . PHP_EOL;

	}


	// Curl
	private static function useCurl($url, $headers, $fields = null) {
	        // Open connection
	        $ch = curl_init();
	        if ($url) {
	            // Set the url, number of POST vars, POST data
	            curl_setopt($ch, CURLOPT_URL, $url);
	            curl_setopt($ch, CURLOPT_POST, true);
	            curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
	            curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

	            // Disabling SSL Certificate support temporarly
	            curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
	            if ($fields) {
	                curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
	            }

	            // Execute post
	            $result = curl_exec($ch);
	            if ($result === FALSE) {
	                die('Curl failed: ' . curl_error($ch));
	            }

	            // Close connection
	            curl_close($ch);

	            return $result;
        }
    }

}
?>

TestNotifications.php

<?php

    	require_once('PushNotifications.php');

	// Message payload
	$msg_payload = array (
		'mtitle' => 'Test push notification title',
		'mdesc' => 'Test push notification body',
	);

	// For Android
	// get this from android, inside code
	$regId[] = 'APA91bHdOmMHiRo5jJRM1jvxmGqhComcpVFDqBcPfLVvaieHeFI9WVrwoDeVVD1nPZ82rV2DxcyVv-oMMl5CJPhVXnLrzKiacR99eQ_irrYogy7typHQDb5sg4NB8zn6rFpiBuikNuwDQzr-2abV6Gl_VWDZlJOf4w';
	$regId[] = 'ADS546JRM1jvxmGqhComcpVFDqBcPfFGHGFjH68D1nPZ82rV2DxcyVv-oMMl5CJPhVXnLrzKiacR99eQ_irrYogy7typHQDb5sg4NB8zn6rFpiBuikNuwDQzrjJhvHJJHU7787';

	// For iOS
	//get this from iOS, inside code
	$deviceToken[] = 'FE66489F304DC75B8D6E8200DFF8A456E8DAEACEC428B427E9518741C92C6660';
	$deviceToken[] = 'FEdd56g4DC75B8D6E8200DFF8A456E8DAfdgfdjhfhhC428B45hddf5df92C6660';
	$deviceToken[] = 'dfgggt5677456E8DAfdgfdjhfhhCffndjjiweplk47snn444999sjjgnnmqww6660';
	// For WP8
	$uri = 'http://s.notify.live.net/u/1/sin/HmQAAAD1XJMXfQ8SR0b580NcxIoD6G7hIYP9oHvjjpMC2etA7U_xy_xtSAh8tWx7Dul2AZlHqoYzsSQ8jQRQ-pQLAtKW/d2luZG93c3Bob25lZGVmYXVsdA/EKTs2gmt5BG_GB8lKdN_Rg/WuhpYBv02fAmB7tjUfF7DG9aUL4';

	// Replace the above variable values


    	PushNotifications::android($msg_payload, $regId);

    	PushNotifications::WP8($msg_payload, $uri);

    	PushNotifications::iOS($msg_payload, $deviceToken);

?>

Little tutorial for Android Notifications
https://trinitytuts.com/android-push-notification-using-gcm/
In this tutorial you will be asked for GOOGLE_PROJECT_ID:

for iOS
http://www.raywenderlich.com/32960/apple-push-notification-services-in-ios-6-tutorial-part-1

Put ".pem" file in a folder where you execute TestNotifications.php

When I use your fork I get the following PHP error... any suggestions?

PHP Strict Standards: Non-static method PushNotifications::useCurl() should not be called statically

It should work, since useCurl is static method private static function useCurl()