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if(file_exists($open.".php")

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if(file_exists($open.".php") or (open.".html")

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$open=$_GET['open'];
if(file_exists($open.".php") or file_exists($open.".html")){

  if(empty($open) or $open=="home"){include("home.php");} 
  else{include($open.".html");}
}
else{echo "Die Datei existiert nicht.";}
?>

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