What potential issues can arise when integrating a dropdown menu in PHP with other HTML code on a webpage?

One potential issue that can arise when integrating a dropdown menu in PHP with other HTML code on a webpage is that the dropdown menu may not populate correctly or may not function as expected due to conflicts with the surrounding HTML code. To solve this issue, it is important to ensure that the PHP code for the dropdown menu is properly enclosed within PHP tags and that any necessary HTML elements are correctly formatted and placed within the PHP code.

<?php
// PHP code for generating a dropdown menu
echo '<select>';
echo '<option value="1">Option 1</option>';
echo '<option value="2">Option 2</option>';
echo '<option value="3">Option 3</option>';
echo '</select>';
?>