How can PHP beginners ensure that their scripts do not interfere with the overall style of a website?

PHP beginners can ensure that their scripts do not interfere with the overall style of a website by encapsulating their PHP code within a separate file and including it using PHP include or require statements. This way, the PHP code will be executed separately from the HTML/CSS code, ensuring that it does not affect the styling of the website.

<?php
// Separate PHP code in a separate file (e.g., script.php)
// script.php
// PHP code here
?>

<!DOCTYPE html>
<html>
<head>
    <title>My Website</title>
    <link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
    <?php include 'script.php'; ?>
    <!-- HTML code here -->
</body>
</html>