What are best practices for ensuring PHP code functions correctly within HTML files?

When embedding PHP code within HTML files, it is important to ensure that the PHP code is properly enclosed within <?php ?> tags. Additionally, make sure that the PHP code is written correctly and does not contain any syntax errors. Finally, it is recommended to test the PHP code within the HTML file to ensure that it functions as expected.

&lt;?php
// PHP code here
?&gt;