What are the potential pitfalls of displaying HTML content in PHP?

One potential pitfall of displaying HTML content in PHP is the risk of introducing cross-site scripting (XSS) vulnerabilities if user input is not properly sanitized. To prevent this, always sanitize any user input before outputting it as HTML content. This can be done using functions like htmlspecialchars() or htmlentities() to encode special characters. 

// Example of sanitizing user input before displaying it as HTML content
$user_input = "<script>alert('XSS attack');</script>";
$sanitized_input = htmlspecialchars($user_input);
echo $sanitized_input;

Keywords

XSS security vulnerabilities htmlentities htmlspecialchars input validation

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