Brauche dringend 2 Scripte

<?php


$username="BLA";
$password="BLUB";




// Start der Session
session_start();


unset ($request);
$request = ($_SERVER['REQUEST_METHOD'] === 'GET') ? $_GET : $_POST;


function login_formular()
{
echo '<form action="' , $GLOBALS['PHP_SELF'] , '" method="POST">' , "\n";
echo "<table>\n<tr>\n";
echo "<td>\nUsername: \n</td>\n<td>\n<input type=\"text\" name=\"username\">\n</td>\n</tr>\n<tr>\n";
echo "<td>\nPasswort: \n</td>\n<td>\n<input type=\"password\" name=\"password\">\n</td>\n</tr>\n<tr>\n";
echo "<td colspawn=\"2\">\n<input type=\"submit\" name=\"login\" value=\"Anmelden\">\n</td>\n</tr>\n</table\n";
echo "</form> \n";
}


if  (isset($request['login']))
{       
	if ($username==$request['username'] & $password==$request['password'] ) 
	{	$_SESSION['login_OK']="OK";
		echo "<div align=\"center\"><h1>Wilkommen dein Login ist OK </h1></div>\n";
	} 
	else  
	{ 
	echo "<div align=\"center\"><h1>Login fehlerhaft</h1></div> 
\n";
	login_formular();
	}
}
else
{   
login_formular();
}
?>