Giriş sayfası;

ob_start();
session_start();
?>

// error_reporting(E_ALL);
// ini_set("display_errors", 1);
?>




Tutorialspoint.com








Enter Username and Password








Click here to clean Session.






Logout.php

session_start();
unset($_SESSION["username"]);
unset($_SESSION["password"]);

echo 'You have cleaned session';
header('Refresh: 2; URL = login.php');
?>


Kaynak:
https://www.tutorialspoint.com/php/php_login_example.htm

Bu da sizin istediğiniz;

https://www.tutorialspoint.com/php/php_mysql_login.htm