What are some common pitfalls to avoid when handling URL parameters in PHP?

One common pitfall to avoid when handling URL parameters in PHP is not properly sanitizing and validating user input. This can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To mitigate this risk, always sanitize and validate any input received from URL parameters before using it in your application. 

// Example of sanitizing and validating URL parameters in PHP
$user_id = isset($_GET['user_id']) ? intval($_GET['user_id']) : null;

if ($user_id) {
    // Use the sanitized user_id parameter in your application logic
} else {
    // Handle invalid input or display an error message
}

Keywords

SQL injection cross-site scripting URL encoding validation sanitization

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