How can PHP code be executed in an HTML file for dynamic content generation?

To execute PHP code in an HTML file for dynamic content generation, you can simply embed the PHP code within <?php ?> tags. This allows the PHP interpreter to recognize and execute the code within the HTML file. This way, you can mix PHP code with HTML to create dynamic web pages.

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Dynamic Content&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;h1&gt;Welcome &lt;?php echo &quot;User&quot;; ?&gt;&lt;/h1&gt;
&lt;/body&gt;
&lt;/html&gt;