What are the potential pitfalls of using PHP to generate and display dynamic content on a webpage?

One potential pitfall of using PHP to generate and display dynamic content on a webpage is the risk of cross-site scripting (XSS) attacks if user input is not properly sanitized. To prevent this, always sanitize and validate user input before displaying it on the webpage. 

// Sanitize user input before displaying on the webpage
$userInput = "<script>alert('XSS attack!');</script>";
$sanitizedInput = htmlspecialchars($userInput, ENT_QUOTES, 'UTF-8');
echo $sanitizedInput;

Keywords

SQL injection cross-site scripting insecure file uploads session hijacking server-side validation

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