层叠菜单的动态生成 - PHP

层叠菜单的动态生成

<HTML><BODY BGCOLOR=FFFFFF>
<FORM ACTION="<?php echo $PATH_INFO?>" METHOD=POST>
<?php
  if (isset($hierarchy)){
      //$hierarchy[] = $selection;
      if (isset($hierarchy)){
        while(list($level, $sel) = each($hierarchy)){
          echo "<INPUT TYPE=HIDDEN NAME=hierarchy[$level] VALUE=$sel>";
          echo $level, ': ', $sel, "<BR>n";
          $nextlevel = (int) $level + 1;
        }
    }
  }
  else{
      $nextlevel = 0;
  }
  echo "<SELECT NAME=hierarchy[", $nextlevel, "]>n";
  for ($I = 1; $I <= 10; $I++){
    echo "<OPTION VALUE=$I>$I</OPTION>n";
  }
  echo "</SELECT>n";
?>
<INPUT TYPE=SUBMIT>
</FORM>
</BODY></HTML>