I found a way to log out easily
<?php
ob_start();
if (!isset($_SERVER['PHP_AUTH_USER']) || $_COOKIE['isin'] != "1") {
header('WWW-Authenticate: Basic realm="My Realm"');
header('HTTP/1.0 401 Unauthorized');
setcookie ("isin", "1");
die('<a href="orderhan.php">Login</a>');
}
else {
if($_SERVER['PHP_AUTH_USER'] == "USER" && $_SERVER['PHP_AUTH_PW']== "PASSWORD") {
echo "you got in";
echo "<a href='".$_SEVER['PHP_SELF']."?action=logout'>logout</a>";
}
else {
setcookie ("isin", "", time() - 3600);
$url=$_SERVER['PHP_SELF'];
header("location: $url");
}
if($_GET['action'] == "logout") {
setcookie ("isin", "", time() - 3600);
$url=$_SERVER['PHP_SELF'];
header("location: $url");
}
}
ob_end_flush();
?>
