What are some common pitfalls to avoid when working with parameters in PHP?

One common pitfall to avoid when working with parameters in PHP is not properly sanitizing user input, which can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To mitigate this risk, always validate and sanitize user input before using it in your code. 

// Sanitize user input using filter_input()
$user_input = filter_input(INPUT_POST, 'user_input', FILTER_SANITIZE_STRING);

// Validate user input to ensure it meets certain criteria
if (strlen($user_input) < 5) {
    // Handle error
}

Keywords

type juggling SQL injection cross-site scripting variable scope data validation

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