Is it valid to mix HTML and PHP code within the same file for output?

Mixing HTML and PHP code within the same file is a common practice in web development to dynamically generate content. This allows for easier integration of PHP logic with HTML structure. To do this, simply enclose the PHP code within `<?php ?>` tags within the HTML file. This way, the PHP code will be executed on the server side before the HTML is sent to the client's browser. 

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;PHP and HTML 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;

Keywords

HTML PHP code mixing file output validation

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