What potential issues may arise when combining PHP and XHTML?

One potential issue that may arise when combining PHP and XHTML is that PHP code may not be properly interpreted within XHTML files. To solve this issue, you can use the `<?php ?>` tags to encapsulate your PHP code within the XHTML file. 

&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;&lt;?php echo &quot;Hello, World!&quot;; ?&gt;&lt;/h1&gt;
&lt;/body&gt;
&lt;/html&gt;

Keywords

XHTML PHP compatibility validation syntax

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