FCM_example1

function sendPushToAndroid($tokens, $title, $body, $data){
    $API_ACCESS_KEY = 'AIzaSyDlU1Ss6pMQezakN67nM8SEVcTJNnVm45M';

    $msg = [
        'body'  => $body,
        'title' => $title,
        //'icon'    => 'myicon',/*Default Icon*/
        'sound' => 'default'/*Default sound*/
    ];

    if(is_array($tokens)){
        $fields = [
            'registration_ids'  => $tokens,
            'notification'      => $msg,
            'data'              => $data
        ];
    }else{
        $fields = [
            'to'            => $tokens,
            'notification'  => $msg,
            'data'          => $data
        ];
    }

    $headers = [
        'Authorization: key=' . $API_ACCESS_KEY,
        'Content-Type: application/json'
    ];

    $ch = curl_init();
    curl_setopt( $ch,CURLOPT_URL, 'https://fcm.googleapis.com/fcm/send' );
    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 );
    curl_setopt( $ch,CURLOPT_POSTFIELDS, json_encode( $fields ) );
    $result = curl_exec($ch );
    curl_close( $ch );
    //echo $result;
}