Are there any specific PHP functions or methods that should be avoided or used with caution when converting PHP files to HTML files?

When converting PHP files to HTML files, it is important to avoid using PHP functions or methods that rely on server-side processing, as they will not work in a static HTML environment. Functions like include(), require(), and file_get_contents() should be used with caution or avoided altogether. Instead, focus on using HTML markup and CSS for layout and styling.

// Avoid using include() function in PHP files that are being converted to HTML
// Use static HTML markup instead

// Incorrect usage
<?php include('header.php'); ?>

// Correct usage
<header>
    <h1>Welcome to my website</h1>
</header>