[PHP & MySQL] Problem bei php-Login

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<?
$pw=$HTTP_POST_VARS['pw'];
$uname=$HTTP_POST_VARS['uname'];


if($uname=="Test" and $pw=="test"){
$yes ="1";
$job ="Tierarzt";
}

if($yes=="1")
{
session_start ();
$_SESSION["user_name"] =$uname;
$_SESSION["user_job"] =$job;
header("location: intern.php");
}
?>