Update

cgi-bin/uebung08/hangman_lib.php

@@ -61,7 +61,7 @@ function guessLetter($letter) {
     }
     
     //Append the guessed letter
-    $_SESSION['guessedLetters'][] = $letter;
+    array_push($_SESSION['guessedLetters'], $letter);
     
     //Add the letter to the mask
     $guessword = str_split($_SESSION['toGuess']);