PHP Recursive Wireless level classification

1<meta http-equiv= "Content-type" content= "Text/html;charset=utf-8" >2<?PHP3 $tree=Array(4     Array(' id ' =>1, ' name ' = ' Anhui ', ' pid ' = ' 0 '),5     Array(' id ' =>2, ' name ' = ' Beijing ', ' pid ' = ' 0 '),6     Array(' id ' =>3, ' name ' = ' Shandong ', ' pid ' = ' 0 '),7     Array(' id ' =>4, ' name ' = ' Zhaoyang District ', ' pid ' = ' 2 '),8     Array(' id ' =>5, ' name ' = ' Hefei ', ' pid ' = ' 1 '),9     Array(' id ' =>6, ' name ' = ' Shushan District ', ' pid ' = ' 5 '),Ten     Array(' id ' =>7, ' name ' = ' Yantai ', ' pid ' = ' 3 '), One     ); A /** - * @param $data array - * @param $pid parent_id the * @param $level - * @author Tian -  */ - functionTree$data,$pid=0,$level=1){ +     Static $arr=Array(); -     foreach($data  as $v){ +         if($v[' PID ']==$pid){ A             $v[' Level ']=$level; at             $arr[]=$v; -Tree$data,$v[' ID '],$level+1); -         } -     } - return $arr; - } in  - $list=tree ($tree, 0,1); to Var_dump($list); +?>

PHP Recursive Wireless level classification