Authentication and Authorization in PHP

 Authentication and Authorization in PHP

PHP can be used to implement user authentication and authorization in web applications. Authentication verifies the identity of a user, while authorization checks if a user has access to specific resources.

Example:

php

// check if user is authenticated

session_start();

if (isset($_SESSION["username"])) {

    echo "Welcome " . $_SESSION["username"];

} else {

    header("Location: login.php");

}

// check user authorization

if (in_array("admin", $_SESSION["roles"])) {

    // grant access to admin page

} else {

    // redirect to unauthorized page

}