Is it recommended to use PHP or JavaScript for implementing popups in this scenario?

In this scenario, it is recommended to use JavaScript for implementing popups as it provides better user experience and interactivity on the client-side. PHP can be used to handle server-side logic or data processing, but for dynamic and interactive elements like popups, JavaScript is the preferred choice.

// PHP code for generating a JavaScript popup
echo '<script>';
echo 'alert("This is a popup message!");';
echo '</script>';