What are the potential pitfalls of using require to include HTML content in a PHP file?

When using `require` to include HTML content in a PHP file, one potential pitfall is that the HTML content may not be properly escaped, leading to security vulnerabilities like cross-site scripting (XSS) attacks. To solve this issue, you should use `htmlspecialchars` or `htmlentities` to escape the HTML content before including it in the PHP file. 

<?php
// HTML content to be included
$htmlContent = "<h1>Welcome to my website</h1>";

// Escape HTML content before including
echo htmlspecialchars($htmlContent);
?>

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require include HTML content PHP file potential pitfalls

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