$title = "Welcome to My Website";
echo "<title>$title</title>";

$name = $_GET['name'];
$title = "Hello, $name! | My Website";
echo "<title>$title</title>";

$postId = $_GET['postId'];
$query = "SELECT title FROM posts WHERE id = $postId";
$result = mysqli_query($connection, $query);
$row = mysqli_fetch_assoc($result);
$title = $row['title'];
echo "<title>$title</title>";

$page = $_GET['page'];
if ($page === 'home') {
    $title = "Welcome to My Website";
} elseif ($page === 'about') {
    $title = "Learn About Us";
} else {
    $title = "Page Not Found";
}
echo "<title>$title</title>";