add test sql injection, add protectin agains it (lvl. 1)

Zweites Jahr/Kryptologie/vigenere.php

@@ -2,11 +2,11 @@
 
 
 
-function vigenere($text,$shift){
+function vigenere($text,$code){
     $result = "";
 
     for ($i = 0; $i < strlen($text); $i++){
-        $shift = $shift[$i%strlen($shift)];
+        $shift = $code[$i%strlen($code)-1];
         $letter = $text[$i];
         $letter = ord($letter);