Firebase Api Key is not working for iOS only - php

Question

I want to send push notification using firebase in php. My code is working fine for android but not working for ios device.
And I am getting success:1 for both cases.
Here is my code
<?php
$path_to_firebase_cm = 'https://fcm.googleapis.com/fcm/send';
$fields = array('registration_ids' => $token,
'data' => array('title'=>'Title',
'body'=>$message['message'],
'image'=>$imagepath,
'priority'=>'high'
)
);
$headers = array(
'Authorization:key=AIzaSyBiOCXbU7roG59_**********vWa4Xc' ,
'Content-Type:application/json'
);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $path_to_firebase_cm);
curl_setopt($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);
curl_close($ch);
return $result;
?>
And response is
stdClass Object
(
[multicast_id] => 8.5168949472892E+18
[success] => 1
[failure] => 0
[canonical_ids] => 0
[results] => Array
(
[0] => stdClass Object
(
[message_id] => 0:1493801065120413%2d69fd2bf9fd7ecd
)
)
)

Answer 1

Delete app from iphone and install again, After that you will get new firebase token try to send push again.
Debug this first from php side they are sending push on newer device token.