Simple Server-Side Handling of HTTP Methods

// index.php
$method = $_SERVER['REQUEST_METHOD'];
if ($method === 'GET') {
    // Handle GET request
    echo json_encode($data);
} elseif ($method === 'POST') {
    // Handle POST request
    $data = json_decode(file_get_contents('php://input'), true);
    echo json_encode(['message' => 'Data received.']);
}
// Add similar blocks for other HTTP methods