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ÐòºÅ  ´óÀà±ð  СÀà±ð 
1    A      A1 A2 A3
2    B      B1 B2
3    C      C1 C2 C3
4    D      D1

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id  cate_name  pid
1  A          0
2  B          0
3  C          0
4  D          0
5  A1        1
6  A2        1
7  A3        1
8  B1        2
...

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$cate_parents = $conn->query("select * from category where pid=0");
$cates = $conn->query("select * from category");

for($i=0;$cate_parent=$conn->mysql_fetch_array($cate_parents); $i++){
echo " <b>".$cate_parent['cate_name']." </b> <br/>";
  for($j=0;$cate=$conn->mysql_fetch_array($cates); $j++){  //×ÓÑ­»· ²»ÄÜÔÙ´Îȡֵ
  if($cate['pid']==$cate_parent['id'])
    echo $cate['cate_name']." <br/>";
}

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