<form action="http://localhost/dummy.php" method="get">
<input type="text" name="suche">
<input type="submit">
</form>
<table>
<tr><th>ort_id</th><th>ort</th><tr>
<?php
include "../DbConnect.php";
$result = mysql_query("SELECT ort_id, ort FROM orte");
while ($row = mysql_fetch_row($result)) {
  $ergebnis = sucheAehnliche ($row[1], $_GET['suche']);
  if ($ergebnis) {
    echo "<tr><td>$row[0]</td><td>$row[1]</td></tr>";
  }
}

function sucheAehnliche ($sucheIn, $sucheNach) {
  $treffer = false;
  $arSI = explode(' ', $sucheIn);
  $arSN = explode(' ', $sucheNach);
  foreach ($arSI as $stringSI) {
    $seSI = soundex($stringSI);
    foreach ($arSN as $stringSN) {
      if ($seSI == soundex($stringSN)) {
        $treffer = true;
        break 2;
      }
    }
  }
  return $treffer;
}
?>
</table>