使用MySQL查询作为PHP脚本的标识，将FCM Push通知发送到android应用中的特定设备

Question

I want to send FCM push notifications in specific android users only using their token saved in mysql database as identification. here's my current progress

PHP Script Snippet Code: Report_Status.php (File 1)

//Gets the token of every user and sends it to Push_User_Notification.php 
while ($User_Row = mysqli_fetch_array($Retrieve_User, MYSQLI_ASSOC)){
            $User_Token = $User_Row['User_Token'];
            include "../Android_Scripts/Notifications/Push_User_Notification.php";
            $message = "Your Report has been approved! Please wait for the fire fighters to respond!";
            send_notification($User_Token, $message);
        }

PHP code for File 2: Push_User_Notification.php

<?php  //Send FCM push notifications process
include_once("../../System_Connector.php");

function send_notification ($tokens, $message)
{
    $url = 'https://fcm.googleapis.com/fcm/send';
    $fields = array(
         'registration_ids' => $tokens,
         'data' => $message
        );
    $headers = array(
        'Authorization:key = API_ACCESS_KEY',
        'Content-Type: application/json'
    );

   $ch = curl_init();
   curl_setopt($ch, CURLOPT_URL, $url);
   curl_setopt($ch, CURLOPT_POST, true);
   curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
   curl_setopt ($ch, CURLOPT_SSL_VERIFYHOST, 0);  
   curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
   curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($fields));
   $result = curl_exec($ch);           
   if ($result === FALSE) {
       die('Curl failed: ' . curl_error($ch));
   }
   curl_close($ch);
}

?>

Problem:

The page is always stuck in Report_Status.php every time I ran the script. It is supposed to go in Push_User_Notification and return to Report_Status once the process is done. Am I wrong in the implementation of calling the Push_User_Notification.php or the receiving parameters to Push_User_Notification.php ?

PS

Here's my full source code of Report_Status.php in case anyone wants to check it: Report_Status.php

Answer 1

I think the problem you may be having is that you are sending a lot of notifications to several devices in short amount of time. I think it might be being picked up as spaming. My suggestion is sending one notification to multiple devices.

Try changing your code in report_status.php to this.

include "../Android_Scripts/Notifications/Push_User_Notification.php";
$message = "Your Report has been approved! Please wait for the fire fighters to respond!";
while ($User_Row = mysqli_fetch_array($Retrieve_User, MYSQLI_ASSOC)){
    $User_Token[] = $User_Row['User_Token'];
}
$tokens = implode(",", $User_Token);
send_notification($tokens, $message);

the idea is that you will collect the user tokens in $User_Token[] array. Then you would comma seperate the tokens and send the message once to all the devices that associate to the tokens. FCM allows you to send to multiple tokens in one go.

updated

$User_Token needs to be an array. so remove the implode. That was my mistake.

Secondly the $message needs to be in the following format.

$message = array(
    'title' => 'This is a title.',
    'body' => 'Here is a message.'
);

Also another thing to note is that there are 2 types of messages you can send using FCM. Notification Messages or Data Messages. Read more here: https://firebase.google.com/docs/cloud-messaging/concept-options

I dont know if your app is handling the receipt of messages (i dont know if you have implemented onMessageRecieve method) so i would probably suggest making a small change to the $fields array in send_notification function. Adding the notification field allows android to handle notifications automatically if your app is in the background. So make sure you app is in the background when testing. https://firebase.google.com/docs/cloud-messaging/android/receive

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

So try the code below. I have tried and tested. It works for me. If it does not work. In send_notification function echo $result to get the error message. echo $result = curl_exec($ch); Then we can work from there to see what is wrong. You can see what the errors mean here: https://firebase.google.com/docs/cloud-messaging/http-server-ref#error-codes

include "../Android_Scripts/Notifications/Push_User_Notification.php";
$message = array(
    'title' => 'Report Approved',
    'body' => 'Your Report has been approved! Please wait for the fire fighters to respond!'
);
while ($User_Row = mysqli_fetch_array($Retrieve_User, MYSQLI_ASSOC)){
    $User_Token[] = $User_Row['User_Token'];
}
send_notification($User_Token, $message);