Hey, Today we learn how to send push notification for android in php.

First create a class with following code

 
<?php

class Pusher{
const GOOGLE_GCM_URL = 'https://android.googleapis.com/gcm/send';
private $apiKey;
private $proxy;
private $output;
public function __construct($apiKey, $proxy = null)
{
$this->apiKey = 'your_key';
$this->proxy = $proxy;
}
/**
* @param string|array $regIds
* @param string $data
* @throws Exception
*/
public function notify($regIds, $data)
{
// pr($data);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, self::GOOGLE_GCM_URL);
if (!is_null($this->proxy)) {
curl_setopt($ch, CURLOPT_PROXY, $this->proxy);
}
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, $this->getHeaders());
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_POSTFIELDS, $this->getPostFields($regIds, $data));
$result = curl_exec($ch);
if ($result === false) {
throw new Exception(curl_error($ch));
}
curl_close($ch);
// pr($result); die;
$this->output = $result;
return $result;
}
/**
* @return array
*/
public function getOutputAsArray()
{
return json_decode($this->output, true);
}
/**
* @return object
*/
public function getOutputAsObject()
{
return json_decode($this->output);
}

private function getHeaders(){
    return [
        'Authorization: key=' . $this-&gt;apiKey,
        'Content-Type: application/json'
    ];
}

private function getPostFields($regIds, $data){
    $fields = [
        'registration_ids' =&gt; is_string($regIds) ? [$regIds] : $regIds,
        'data'             =&gt; is_string($data) ? ['message' =&gt; $data] : $data,
    ];
    return json_encode($fields, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE);
}

}

now call your notify function by creating a object of pusher class.

 
$notification = array("title" => $title,
"message" => $message,
"data" => $data,
);

$pusher = new Pusher($apiKey);
$pusher->notify($reg_ids, $notification); // reg_ids are the device ids on which you want to send push

If you are using cakephp or any other php framework then add pusher class in you plugin folder(appPluginPusherPusher.php) and load it where you want to use.