传进一个含id,pid,..的数组:
function catetree($arr,$id=0,$lev) { $tree=array(); foreach ($arr as $v) { if($v['pid']==$id) { $v['lev']=$lev; $tree=$v; $tree=array_merge($tree,catetree($arr,$v['id'],$lev+1)); } } return $tree;}