$menu_data = array(
"aktuell"    => array("Aktuell", "/"),
"person"    => array("Zur Person", "/person.html"),
"artikel"    => array("Artikel", "/artikel/"),
"service"    => array("Service", "/service/"),
"links"      => array("Links", "/links.html"),
"impressum"  => array("Impressum", "/impressum.html")
);


$navi = "<ul>\n";
foreach ($menu_data as $key => $value) {
  $navi .= " <li>";
    if($key != $current_page) {
    $navi .= "<a href='".$value[1]."'>";
    }
  $navi .= $value[0];
    if($key != $current_page) {
    $navi .= "</a>";
    }
  $navi .= "</li>\n";
}
$navi .= "</ul>";
echo $navi;

<?php
$a_menu["aktuell"] = array("menuNameAktuell","menuDivClassAktuell","subMenuNameAktuell","subMenuUrlA");
$a_menu["person"] = array("menuNamePerson","menuDivClassPerson","subMenuNamePerson","subMenuUrlP");
$a_menu["artikel"] = array("menuNameARtikel","menuDivClassAR","subMenuNameARtikel","subMenuUrlAR");
echo '<ul>';
foreach ($a_menu as $key => $arrayValue) {
  echo '<li><b>'.$key.'</b><ul><li>'.$arrayValue[0].' => '.$arrayValue[1]
 .'<br><a href="'.$arrayValue[3].'">'.$arrayValue[2].'</a></ul>';
}
echo '</ul>';
?>