What are the best practices for including PHP code within HTML blocks?

When including PHP code within HTML blocks, it is important to use the correct syntax to ensure proper execution. One common method is to use the PHP opening and closing tags <?php ?> to encapsulate the PHP code within the HTML block. This allows the PHP code to be processed by the server before the HTML is rendered to the browser.

&lt;div&gt;
    &lt;p&gt;Welcome, &lt;?php echo $username; ?&gt;!&lt;/p&gt;
&lt;/div&gt;