What are some potential pitfalls when using PHP to handle links and templates in a web application?

One potential pitfall when using PHP to handle links and templates in a web application is the risk of injection attacks if user input is not properly sanitized. To prevent this, always validate and sanitize user input before using it in links or templates.

// Sanitize user input before using it in a link
$link = htmlspecialchars($_GET['link']);
echo "<a href='$link'>Click here</a>";