What is the potential issue with the code snippet provided that leads to a parse error in PHP?

The issue with the code snippet provided is that the closing PHP tag "?>" is followed by some whitespace characters or newlines. This can lead to a parse error in PHP because any output generated after the closing tag will be sent to the browser, which can cause issues with headers being sent. To solve this issue, simply remove any whitespace characters or newlines after the closing PHP tag.

<?php
// Some PHP code here
?>

<!-- HTML code here without any whitespace or newlines after the closing PHP tag -->