What are the potential pitfalls of using $_GET to pass values in a PHP script?

Using $_GET to pass values in a PHP script can potentially expose your application to security vulnerabilities such as cross-site scripting (XSS) attacks. To mitigate this risk, you should always sanitize and validate any values received through $_GET before using them in your script. 

// Sanitize and validate the value received through $_GET
$id = isset($_GET['id']) ? filter_var($_GET['id'], FILTER_SANITIZE_NUMBER_INT) : null;

// Proceed with using the sanitized value
if ($id !== null) {
    // Your code here
}

Keywords

$_GET security vulnerabilities data validation SQL injection cross-site scripting

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