PHP的栏目导航程序

<?php
$d_label=array("service"=>"有偿服务","teach"=>"家教中心","union"=>"校园服务联盟","job"=>"学生兼职","free"=>"信息库");
$directory=$REQUEST_URI;
while($directory!="/")
{
  $d_text=basename($directory);
  if(isset($d_label[$d_text])){$d_text=$d_label[$d_text];}
  $d_link=$directory;
  $d_curx="-><a href=\"$d_link\">$d_text</a>";
  $d_komplettx=$d_curx.$d_komplettx;
  $directory=dirname($directory);
}
  echo "栏目导航:".$d_komplettx;
?>