[PHP] Array mysteries

[Otto Wyss]

I want to convert weekdays with a simple function like
  $wdays = array
    (0 => "Sonntag"
    ,1 => "Montag"
    ,2 => "Dienstag"
    ,3 => "Mittwoch"
    ,4 => "Donnerstag"
    ,5 => "Freitag"
    ,6 => "Samstag"
  );

  function convert_from_weekday ($weekday) {
    return $wdays[$weekday];
  }

but this doesn't work while

  $wdays[$weekday];

outside of the function works correct. Has anybody an idea where's my 
mistake? I'd like to use a function so I may return substrings of the 
weekday.

O. Wyss

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