How to send push notifications to multiple devices using php script using FCM?

Question

I\'m new to push notifications using FCM from php to Android devices. From android side I have generated FCM reg_id & send it over php script & store into mysql data

Answer 1

To send firebase notifications to multiple users at once

add multiple firebase tokens to an array.

$token_ids = array('token1', 'token2');

Pass the tokens to the below shown function

Using below shown function you can also send images with your notification

if you don't want to send any image then just pass empty string

sendFirebaseNotification($token_ids ,"notification title", "message", "image_url");

I use this function

function sendFirebaseNotification($fb_key_array, $title, $message, $imageURL){
    $authorization_key = "your_auth_key";

    $finalPostArray = array('registration_ids' => $fb_key_array,
                            'notification' => array('body' => $message,
                                                    'title' => $title,
                                                    "image"=> $imageURL),
                            "data"=> array("click_action"=> "FLUTTER_NOTIFICATION_CLICK",
                                            "sound"=> "default", 
                                            "status"=> "done")); 
    
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,"https://fcm.googleapis.com/fcm/send");
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS,json_encode($finalPostArray));  //Post Fields
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json', 'Authorization: key='.$authorization_key));
    $server_output = curl_exec ($ch);
    curl_close ($ch);
    //echo $server_output; 
}