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I apologize for the confusion. To implement a Web Push Notification server in PHP without using Minishlink\WebPush\VAPID, you can follow these steps:

1. Set up your project:

Create a new folder for your project and set up a new PHP file (e.g., push_server.php) to handle push notifications.

2. Install required dependencies:

You don't need any external libraries for this approach.

3. Create a push notification endpoint:

In your push_server.php, create an endpoint that will handle the subscription data sent from the client-side JavaScript:

<?php
// Endpoint to handle push subscription from the client
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['subscription'])) {
    // Get the subscription data from the request
    $subscription = json_decode($_POST['subscription'], true);

    // Save the subscription data to a database or file (you should implement this)

    // Send a response indicating the subscription was successful
    http_response_code(201);
    echo json_encode(['success' => true]);
    exit;
}

http_response_code(400);
echo json_encode(['error' => 'Bad request']);
exit;

4. Sending Push Notifications:

To send push notifications to subscribed clients, you can create another PHP script (e.g., send_notification.php). This script will be responsible for sending the push notifications to the subscribed clients.

<?php
// Load your saved subscriptions from the database or file
$subscriptions = getSubscriptionsFromDatabase(); // You should implement this function

// Set the payload data for the push notification
$message = 'Hello, this is a push notification!';

// Loop through each subscription and send the notification
foreach ($subscriptions as $subscription) {
    // Define the notification payload
    $payload = json_encode(['title' => 'Push Notification', 'body' => $message]);

    // Replace the following with your own VAPID keys
    $publicKey = 'your_vapid_public_key';
    $privateKey = 'your_vapid_private_key';

    // Generate the encrypted data and the headers for the request
    $encryptedData = '';
    $headers = [
        'TTL' => 300, // Time to Live for the notification
        'Content-Type' => 'application/json',
        'Authorization' => 'Bearer ' . base64_encode($privateKey),
    ];

    // Send the push notification
    $ch = curl_init($subscription['endpoint']);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);
    curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    $response = curl_exec($ch);
    curl_close($ch);

    // Process the response as needed (e.g., check for errors)
    // ...
}

Remember to replace 'your_vapid_public_key' and 'your_vapid_private_key' with your actual VAPID keys, which can be generated using the appropriate tools or services.

Please note that this example is a basic implementation to demonstrate the concept. In a real-world scenario, you would need to handle proper error checking, managing subscriptions, and securely storing VAPID keys. Additionally, you might want to implement a cron job or other scheduling mechanisms to periodically send push notifications to subscribers.