What are the potential security risks of using query strings in PHP for access control?

Using query strings in PHP for access control can pose security risks such as exposing sensitive information in URLs, allowing for easy tampering of data by users, and making it vulnerable to SQL injection attacks. To mitigate these risks, it is recommended to use server-side validation and authentication mechanisms to control access to resources. 

// Example of using server-side validation and authentication to control access
session_start();

// Check if user is logged in before granting access
if (!isset($_SESSION['logged_in']) || $_SESSION['logged_in'] !== true) {
    header('Location: login.php');
    exit;
}

// Access granted, continue with the rest of the code

Keywords

SQL injection XSS access control query strings security risks

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