How can PHP code be properly inserted into a PHP page without disrupting the layout?

When inserting PHP code into a PHP page, it is important to ensure that the code is properly enclosed within PHP tags (`<?php ?>`) to avoid disrupting the layout. Additionally, it is recommended to separate PHP logic from HTML markup by using PHP to generate dynamic content. This can be achieved by echoing PHP variables or using control structures like loops and conditionals within the HTML markup.

&lt;?php
// Example of properly inserting PHP code into a PHP page without disrupting the layout
$name = &quot;John Doe&quot;;
?&gt;

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Welcome&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;h1&gt;Welcome, &lt;?php echo $name; ?&gt;!&lt;/h1&gt;
&lt;/body&gt;
&lt;/html&gt;