How can one effectively include HTML code between variable definitions and content in PHP scripts?

To include HTML code between variable definitions and content in PHP scripts, you can use the PHP echo statement to output the HTML code within the PHP script. This allows you to seamlessly mix PHP variables and HTML content in your script.

<?php
$variable1 = "Hello";
$variable2 = "World";

echo "<h1>$variable1 $variable2!</h1>";
?>