How can PHP developers ensure cross-browser compatibility when using PHP to enhance forum features like music embedding?

To ensure cross-browser compatibility when using PHP to enhance forum features like music embedding, PHP developers can use HTML5 audio tags with multiple source formats to support different browsers. By providing fallback options and testing the functionality on various browsers, developers can ensure a seamless experience for forum users.

<?php
echo '<audio controls>';
echo '<source src="audio.mp3" type="audio/mpeg">';
echo '<source src="audio.ogg" type="audio/ogg">';
echo 'Your browser does not support the audio tag.';
echo '</audio>';
?>