What considerations should be made when building a XHTML-valid .php file?

When building a XHTML-valid .php file, it is important to ensure that the PHP code is properly embedded within the XHTML structure. This means using PHP opening and closing tags within the HTML tags, and making sure that all XHTML rules are followed, such as using self-closing tags for elements like <img> and <br>. Additionally, any PHP output should be properly escaped to prevent XSS attacks. 

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;XHTML-valid PHP File&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;h1&gt;Welcome to my XHTML-valid PHP file!&lt;/h1&gt;
    
    &lt;?php
        // PHP code here
        $name = &quot;John&quot;;
        echo &quot;&lt;p&gt;Hello, $name!&lt;/p&gt;&quot;;
    ?&gt;
&lt;/body&gt;
&lt;/html&gt;

Keywords

XHTML PHP file structure validation error handling

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