面包屑导航

你能帮我完成这个面包屑导航工作吗。我的php不好。我还在学习。

这是我的猫在mysql

cats_id   cats_position   cats_parentid 
1            1>                0
2            1>2>              1
3            3>                0
4            1>2>4>            2

我试过这样的方法，但不是正确的方法。你能告诉我正确的路吗。

$pieces = explode(">", $position);
if ($pieces[0] != "")
{
 $result = mysql_query("SELECT * FROM cats
 WHERE cats_id='$pieces[0]'");
 while($row = mysql_fetch_array($result))
   {
$piecesid0 = $row['cats_id'];
$piecesname0 = $row['cats_name'];
$piecesposition0 = $row['cats_position'];
   }
}
if ($pieces[1] != "")
{
 $result = mysql_query("SELECT * FROM cats
 WHERE cats_id='$pieces[1]'");
 while($row = mysql_fetch_array($result))
   {
$piecesid1 = $row['cats_id'];
$piecesname1 = $row['cats_name'];
$piecesposition1 = $row['cats_position'];
   }
}
if ($pieces[2] != "")
{
 $result = mysql_query("SELECT * FROM cats
 WHERE cats_id='$pieces[2]'");
 while($row = mysql_fetch_array($result))
   {
$piecesid2 = $row['cats_id'];
$piecesname2 = $row['cats_name'];
$piecesposition2 = $row['cats_position'];
   }
}
if ($pieces[3] != "")
{
 $result = mysql_query("SELECT * FROM cats
 WHERE cats_id='$pieces[3]'");
 while($row = mysql_fetch_array($result))
   {
$piecesid3 = $row['cats_id'];
$piecesname3 = $row['cats_name'];
$piecesposition3 = $row['cats_position'];
   }
}
?>
<a href="index.php">Index</a> > 
<a href="cats.php?cat=<?=$piecesid0;?>&parent=0&position=<?=$piecesposition0;?>"><?=$piecesname0;?></a>
<?
If ($piecesid1 != "")
{
?>
> <a href="cats.php?cat=<?=$piecesid1;?>&parent=<?=$piecesid0;?>&position=<?=$piecesposition1;?>"><?=$piecesname1;?></a>
<?
}
?>
<?
If ($piecesid2 != "")
{
?>
> <a href="cats.php?cat=<?=$piecesid2;?>&parent=<?=$piecesid1;?>&position=<?=$piecesposition2;?>"><?=$piecesname2;?></a>
<?
}
?>
<?
If ($piecesid3 != "")
{
?>
> <a href="cats.php?cat=<?=$piecesid3;?>&parent=<?=$piecesid2;?>&position=<?=$piecesposition3;?>"><?=$piecesname3;?></a>
<?
}
?>