How can PHP be used effectively in conjunction with XHTML?

PHP can be used effectively in conjunction with XHTML by embedding PHP code within the XHTML file using the `<?php ?>` tags. This allows for dynamic content generation and manipulation within the XHTML document. Additionally, PHP can be used to interact with databases, handle form submissions, and perform other server-side tasks to enhance the functionality of the XHTML page.

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;PHP and XHTML Example&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;h1&gt;Welcome &lt;?php echo &quot;John Doe&quot;; ?&gt;&lt;/h1&gt;
    &lt;p&gt;Today&#039;s date is &lt;?php echo date(&quot;Y-m-d&quot;); ?&gt;&lt;/p&gt;
&lt;/body&gt;
&lt;/html&gt;