What are the potential pitfalls of using GET parameters in PHP for dynamic content display?

Using GET parameters in PHP for dynamic content display can lead to security vulnerabilities such as SQL injection attacks if the parameters are not properly sanitized. To prevent this, always sanitize and validate any user input before using it in your PHP code. 

// Sanitize and validate GET parameter before using it
$userId = isset($_GET['user_id']) ? filter_var($_GET['user_id'], FILTER_SANITIZE_NUMBER_INT) : null;

// Use the sanitized parameter in your code
if ($userId) {
    // Query the database using the sanitized user ID
    $query = "SELECT * FROM users WHERE id = $userId";
    // Execute the query and display the results
}

Keywords

GET parameters PHP dynamic content security vulnerabilities data validation

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