Firebase如何为每个Token推送含不同数据的消息？

Hey there, I get it—you're trying to send FCM messages to 1000 tokens, but need each user to get a unique click_action link to track their clicks. The problem with using registration_ids is that it sends a single, identical payload to all devices, so you can't customize the link per token. Let's go over two solid solutions for this:

Solution 1: Send Individual Messages (Simple & Straightforward) #

For 1000 tokens, looping through each one and sending a separate message is totally feasible—FCM's rate limits handle this easily. You just need to pair each token with its unique tracking parameter (like a user ID or unique hash) and build a custom payload for each.

Here's a PHP example matching your existing code style:

// Assume $tokens is an array of objects/arrays with token + user identifier, e.g.:
// $tokens = [['token' => 'abc123', 'user_id' => 'user_456'], ...]

foreach ($tokens as $userToken) {
    // Build unique tracked link with user-specific parameter
    $trackedLink = "https://site.ru?track_id=" . $userToken['user_id'];
    
    $payload = [
        'to' => $userToken['token'],
        'data' => [
            'title' => 'Title',
            'body' => 'Message',
            'icon' => 'icon.png',
            'image' => 'image.png',
            'click_action' => $trackedLink
        ]
    ];
    
    // Send the request to FCM
    $ch = curl_init("https://fcm.googleapis.com/fcm/send");
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, [
        'Authorization: key=YOUR_FCM_SERVER_KEY',
        'Content-Type: application/json'
    ]);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($payload));
    
    $response = curl_exec($ch);
    curl_close($ch);
    
    // Optional: Log success/failure for each send
}

Pros: Dead simple to implement, full control over each user's link.
Cons: Sends 1000 separate requests, but this is negligible for 1000 tokens.

Solution 2: Use FCM Multicast Messages (Recommended for Admin SDK Users) #

If you're using the Firebase Admin SDK (like the PHP kreait/firebase-php package), the MulticastMessage feature lets you send personalized messages in optimized batches. The SDK handles grouping requests efficiently, so it's faster than manual loops.

Example code:

use Kreait\Firebase\Factory;
use Kreait\Firebase\Messaging\MulticastMessage;
use Kreait\Firebase\Messaging\CloudMessage;

// Initialize Firebase Admin SDK
$factory = (new Factory)->withServiceAccount(__DIR__.'/your-firebase-credentials.json');
$messaging = $factory->createMessaging();

// Build individual messages for each token
$individualMessages = [];
foreach ($tokens as $userToken) {
    $trackedLink = "https://site.ru?track_id=" . $userToken['user_id'];
    
    $individualMessages[] = CloudMessage::withTarget('token', $userToken['token'])
        ->withData([
            'title' => 'Title',
            'body' => 'Message',
            'icon' => 'icon.png',
            'image' => 'image.png',
            'click_action' => $trackedLink
        ]);
}

// Send as multicast
$response = $messaging->sendMulticast(MulticastMessage::fromMessages($individualMessages));

// Handle results
echo "Successfully sent to " . $response->successes()->count() . " devices\n";
echo "Failed to send to " . $response->failures()->count() . " devices\n";

Pros: More efficient than manual loops, built-in error handling, and SDK optimizations.
Cons: Requires setting up the Firebase Admin SDK (worth it if you're working with Firebase regularly).

Key Notes #

• Make sure you store each token alongside a unique user identifier (like user ID) so you can generate the personalized link.
• If you were using the notification field before, avoid setting click_action there—keep all personalized data in the data field to ensure the unique link takes priority.
• FCM's registration_ids limit is 1000 tokens per request anyway, so splitting into individual/multicast messages is necessary for larger lists too.

内容的提问来源于stack exchange，提问作者Rufex