What is the significance of using $_GET[] in PHP for navigation highlighting?

When building a website with multiple pages, it is common to have a navigation menu that highlights the current page the user is on. One way to achieve this in PHP is by using the $_GET[] superglobal array to retrieve the current page's identifier from the URL parameters. By checking if the current page identifier matches the one in the navigation menu, you can apply a specific styling to highlight the active link. 

<?php
$current_page = isset($_GET['page']) ? $_GET['page'] : 'home';

function isPageActive($page) {
    global $current_page;
    if ($current_page == $page) {
        echo 'class="active"';
    }
}

?>

<!-- Navigation Menu -->
<ul>
    <li><a href="index.php?page=home" <?php isPageActive('home'); ?>>Home</a></li>
    <li><a href="index.php?page=about" <?php isPageActive('about'); ?>>About</a></li>
    <li><a href="index.php?page=services" <?php isPageActive('services'); ?>>Services</a></li>
    <li><a href="index.php?page=contact" <?php isPageActive('contact'); ?>>Contact</a></li>
</ul>

Keywords

$_GET[] PHP navigation highlighting significance

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