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sicherer login

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$_SESSION['angemeldet'] = false;
$error = "";
  if(isset($_POST['benutzername'], $_POST['passwort']))     {
      $benutzername = ($_POST['benutzername']);
      $passwort = ($_POST['passwort']);
                  if(!empty($benutzername) && !empty($passwort)) //beide felder ausgefüllt ?
if($benutzername !="dagobert")
  $error="Falscher Benutzername";
if($passwort !=kcud")
  $error .="Falsches Passwort";
if ($error=="")
echo "Erfolgreich angemeldet";
        echo "angemeldet";
        $_SESSION['angemeldet'] = true;            header("Location:gaestebuch_beitrag.php");
     $error .="Falsche Zugangsdaten !<br />";
    $benutzerdaten = fopen("login.txt", "a");
    fwrite($benutzerdaten, "$benutzername::$passwort\n");
     $error .="Felder ausfuellen<br />";
<title> Login </title>
  if($error != "")
  echo ("<p style=\"color:red\")>$error</p>");
<form action="login.php" method="post">
  Benutzer: <br /><input type="text" size="25%" name="benutzername" /><p />
  Passwort: <br /><input type="password" size="25%" name="passwort" /><br />
  <input type="submit" value="Anmelden"/>

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