What are some best practices for integrating PHP code into HTML files?

When integrating PHP code into HTML files, it is important to enclose the PHP code within `<?php ?>` tags. This allows the server to correctly interpret and execute the PHP code. Additionally, using PHP echo statements can help to output dynamic content within the HTML file seamlessly. Example PHP code snippet:

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;PHP Integration&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;h1&gt;Welcome &lt;?php echo &quot;John&quot;; ?&gt;&lt;/h1&gt;
    &lt;p&gt;&lt;?php echo &quot;Today is &quot; . date(&quot;Y/m/d&quot;); ?&gt;&lt;/p&gt;
&lt;/body&gt;
&lt;/html&gt;