Simple PHP class to send Android & iOS Push Notifications

PushNotifications.php

<?php

/**
 * Class to send a Push notification via Google or Apple in a single statment
 */
class Push{

	/**
	 * Either the API Key from Google or the certificate passphrase from Apple
	 * @var string
	 */
	private $API_KEY_OR_PASSPHRASE;
	
	/**
	 * The platform we're sending to  (android|ios)
	 * @var string 
	 */
	private $platform = "android";
	
	/**
	 * The title of the message we're sending
	 * @var string
	 */
	private $title = "";
	
	/**
	 * The content of the message
	 * @var string
	 */
	private $message = "";
	
	/**
	 * The registration IDs to send the notification to
	 * @var array 
	 */
	private $reg_ids = array();
	
	/**
	 * The raw result from the API call
	 * @var string 
	 */
	private $result;
	
	/**
	 * The PEM file for the certificate generated by Apple (for Apple only)
	 * @var string
	 */
	private $pemFile;
	
	/**
	 * Use sandbox? (Apple only)
	 * @var boolean
	 */
	private $sandbox = false;
	
	/**
	 * Any additional data that should be passed into the notification
	 * @var Array
	 */
	private $data = array();
	
	/**
	 * Private constructor - used internally only
	 * @param string $API_KEY_OR_PASSPHRASE
	 */
	private function __construct($API_KEY_OR_PASSPHRASE){
		$this->API_KEY_OR_PASSPHRASE = $API_KEY_OR_PASSPHRASE;
	}
	
	/**
	 * Convenience constructor allows for chaining
	 * @param string $key - Either the Google API key of the Passphrase for 
	 *		the certiifcate from Apple
	 * @return \Push
	 */
	public static function build($key){
		return new Push($key);
	}
	
	/**
	 * Set the title of the message
	 * @param string $title
	 * @return $this
	 */
	public function title($title){
		$this->title = $title;
		return $this;
	}
	
	/**
	 * Add arbitrary data to the notification
	 * @param type $data
	 * @return $this
	 * @throws Exception
	 */
	public function addData($data){
		if(!is_array($data)) throw new Exception("Invalid data - must be an array.");
		$this->data = $data;
		return $this;
	}
	
	/**
	 * Set the content of the message
	 * @param string $message
	 * @return $this
	 */
	public function message($message){
		$this->message = $message;
		return $this;
	}
	
	/**
	 * Set the registration ID's to send the notification to
	 * @param type $reg_ids
	 * @return $this
	 */
	public function to($reg_ids){
		if(is_array($reg_ids)){
			foreach($reg_ids as $id){
				if(!in_array($id, $this->reg_ids)) $this->reg_ids[] = $id;
			}
		}else if(!in_array($reg_ids, $this->reg_ids)) $this->reg_ids[] = $reg_ids;
		return $this;
	}
	
	/**
	 * Send the message
	 * @return $this
	 */
	public function send(){
		return $this->platform === "android" ?
			$this->sendAndroid() : $this->sendiOS() ;
		return $this;
	}
	
	/**
	 * Sets the certificate file for Apple
	 * @param string $pathToPEM
	 * @return $this
	 */
	public function setPEM($pathToPEM, $sandbox=false){
		$this->pemFile = $pathToPEM;
		$this->sandbox = $sandbox;
		$this->platform = "iOS";
		return $this;
	}
	
	/**
	 * Get the result response from the API that sends the notification
	 * @return string
	 */
	public function getResult(){
		return $this->result;
	}
	
	/**
	 * Send the notification via the Google server
	 * @return $this
	 */
	private function sendAndroid(){
		$url = 'https://android.googleapis.com/gcm/send';
		$headers = array(
			'Authorization: key=' . $this->API_KEY_OR_PASSPHRASE,
			'Content-Type: application/json'
		);
		$fields = array(
			'registration_ids'=>$this->reg_ids,
			'data'=>array(
				'title'=>$this->title,
				'message'=>$this->message,
				'subtitle'=>'',
				'tickerText'=>'',
				'msgcnt'=>1,
				'vibrate'=>1,
				'content-available'=>1
			)
		);
		foreach($this->data as $k=>$v) $fields['data'][$k] = $v;
		$this->result = self::useCurl($url, $headers, json_encode($fields));
		return $this;
	}
	
	/**
	 * Send the notification to the APN server
	 * @return $this
	 */
	private function sendiOS(){
		$applePushGateway = $this->sandbox ? 
			"ssl://gateway.sandbox.push.apple.com:2195" :
			"ssl://gateway.push.apple.com:2195" ;
		$ctx = stream_context_create();
		stream_context_set_option($ctx, 'ssl', 'local_cert', $this->pemFile); 
		stream_context_set_option($ctx, 'ssl', 'passphrase', $this->API_KEY_OR_PASSPHRASE);
		$fp = stream_socket_client($applePushGateway, $err, $errstr, 60, STREAM_CLIENT_CONNECT | STREAM_CLIENT_PERSISTENT, $ctx);
		if(!$fp){
			$this->result = "Failed to open stream: $err $errstr";
			return $this;
		}
		$body = array(
			"aps" => array(
				'alert' => array(
					'title' => $this->title,
					'body' => $this->message,
					'contentAvailable' => 1
				)
			)
		);
		foreach($this->data as $k=>$v) $body['aps']['alert'][$k] = $v;
		$payload = json_encode($body);
		$successCnt = 0;
		foreach($this->reg_ids as $deviceToken){
			// Build the binary notification
			$msg = chr(0) . pack('n', 32) . pack('H*', $deviceToken) . pack('n', strlen($payload)) . $payload;
			// Send it to the server
			if(fwrite($fp, $msg, strlen($msg))) $successCnt++;;
		}
		fclose($fp);
		$this->result = "$successCnt of ".count($this->reg_ids)." messages sent.";
		return $this;
	}

	/**
	 * Helper function to send a cURL request
	 * @param string $url
	 * @param array $headers
	 * @param string $fields
	 * @return string
	 */
	private static function useCurl($url, $headers, $fields = null){
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_URL, $url);
		curl_setopt($ch, CURLOPT_POST, true);
		curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
		if($fields) curl_setopt($ch, CURLOPT_POSTFIELDS, $fields);
		$result = curl_exec($ch);
		if($result === FALSE) throw new Exception("cURL failed..");
		curl_close($ch);
		return $result;
	}
}

TestNotifications.php

<?php

require_once('PushNotifications.php');

$platform = ""; 		// "android" or "ios"
$GoogleKey = ""; 		// Google API key from the Firebase console
$regID = "";			// A registration ID from the device (can also be an Array)
$ApplePassphrase = "";	// Passphrase for your Apple certificate file
$ApplePEM = "";			// Path to the .pem certificate file generated from Apple

if($platform === "android"){
	$push = Push::build($GoogleKey)
		->title('Thanks for signing up')
		->message('Your device is now registerd on the network.')
		->to($regID)
		->send();
}else{
	$push = Push::build($ApplePassphrase)
		->setPEM($ApplePEM)
		->title('Thanks for signing up')
		->message('Your device is now registerd on the network.')
		->to($regID)
		->send();
}

echo $push->getResult();

?>

awesome;