PHP does not use recursive infinite class classification

Without recursive implementation of infinite class classification, a simple test of performance than recursion slightly better, but the writing is too complex, or recursive simple convenient point

Code:

<?php$list=Array(Array(' id '=1,' pid '=0,' Deep '=0,' name '=' test1 '),Array(' id '=2,' pid '=1,' Deep '=1,' name '=' Test2 '),Array(' id '=3,' pid '=0,' Deep '=0,' name '=' Test3 '),Array(' id '=4,' pid '=2,' Deep '=2,' name '=' test4 '),Array(' id '=5,' pid '=2,' Deep '=2,' name '=' Test5 '),Array(' id '=6,' pid '=0,' Deep '=0,' name '=' Test6 '),Array(' id '=7,' pid '=2,' Deep '=2,' name '=' Test7 '),Array(' id '=8,' pid '=5,' Deep '=3,' name '=' Test8 '),Array(' id '=9,' pid '=3,' Deep '=2,' name '=' Test9 '),); function resolve($list) {    $newList=$manages=$deeps=$inDeeps=Array();foreach($list  as $row) {$newList[$row[' id ']] =$row; }$list=NULL;foreach($newList  as $row) {if(!isset($manages[$row[' pid ']]) || !isset($manages[$row[' pid ']][' Children '][$row[' id ']])) {if($row[' pid '] >0&&!isset($manages[$row[' pid ']][' Children ']))$manages[$row[' pid ']] =$newList[$row[' pid ']];$manages[$row[' pid ']][' Children '][$row[' id ']] =$row; }if(!isset($inDeeps[$row[' Deep ']]) || ! In_array ($row[' id '],$inDeeps[$row[' Deep ']])) {$inDeeps[$row[' Deep ']][] =Array($row[' pid '],$row[' id ']); }} krsort ($inDeeps); Array_shift ($inDeeps);foreach($inDeeps  as $deep=$ids) {foreach($ids  as $m) {//There are sub-columns to be transferred            if(isset($manages[$m[1]])) {$manages[$m[0]][' Children '][$m[1]] =$manages[$m[1]];$manages[$m[1]] =NULL;unset($manages[$m[1]]); }        }    }return $manages[0][' Children '];}

Recursive implementation

 function resolve2(& $list, $pid = 0) {    $manages=Array();foreach($list  as $row) {if($row[' pid '] ==$pid) {$manages[$row[' id ']] =$row;$children= Resolve2 ($list,$row[' id ']);$children&&$manages[$row[' id ']][' Children '] =$children; }    }return $manages;}

PHP does not use recursive infinite class classification