What are some common pitfalls when using PHP for theme customization in monitoring applications like Nagios?

One common pitfall when using PHP for theme customization in monitoring applications like Nagios is not properly sanitizing user input, which can lead to security vulnerabilities such as cross-site scripting attacks. To solve this issue, always use functions like htmlentities() or htmlspecialchars() to escape user input before displaying it on the webpage. 

// Sanitize user input before displaying it
$user_input = "<script>alert('XSS attack');</script>";
$sanitized_input = htmlentities($user_input);

echo $sanitized_input;

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PHP theme customization Nagios monitoring applications pitfalls

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