<form action="sortieren.php" method="POST">
  <input type="text"  name="zahlen" />
  <input type="submit" value="Do it!" />
  </form>
 
  <?php
 
  $liste = explode(" ", $_POST["zahlen"]);
  foreach ($liste as $value) {
  	  echo $value;
	  echo " ";
  }
 
  echo "<br /> <br /> sortierte Liste: ";
 
  $letztes = count($liste)-1;
  for ($grenze = 0; $grenze<=$letztes-1; $grenze++) {
	$kleinstes = $grenze;
		for ($i = $grenze+1; $i<=$letztes; $i++) {
			if ($liste[$i] < $liste[$kleinstes]) {
				$kleinstes = $i;
			}
		}
	$tauschv = $liste[$grenze];
	$liste[$grenze] = $liste[$kleinstes];
	$liste[$kleinstes] = $tauschv;
  }
 
  foreach ($liste as $value) {
	echo $value;
	echo " ";
  }
 
  ?>