system login log out in php

main.php
<?php

session_start();

// Login
if(isset($_POST['login'])){
    $_SESSION['loggedin'] = true;
    // Add your login authentication here
    // Redirect to dashboard or any other page after successful login
    header('Location: dashboard.php');
    exit;
}

// Logout
if(isset($_POST['logout'])){
    session_unset();
    session_destroy();
    header('Location: login.php'); // Redirect to login page after logout
    exit;
}

?>
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