What potential pitfalls should be considered when using PHP to create dynamic form elements?

One potential pitfall when using PHP to create dynamic form elements is the possibility of introducing security vulnerabilities such as cross-site scripting (XSS) attacks if user input is not properly sanitized. To mitigate this risk, always validate and sanitize user input before using it to generate form elements. 

// Example of sanitizing user input before using it to create a dynamic form element
$user_input = $_POST['user_input'];
$sanitized_input = htmlspecialchars($user_input, ENT_QUOTES, 'UTF-8');

echo "<input type='text' name='dynamic_input' value='$sanitized_input'>";

Keywords

XSS SQL injection form validation CSRF security vulnerabilities

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