PHP不使用递归的无限级分类

<?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 $m) {
// 存在子栏目的进行转移
if (isset($manages[$m[1]])) {
$manages[$m[0]]['children'][$m[1]] = $manages[$m[1]];
$manages[$m[1]] = null;
unset($manages[$m[1]]);
}
}
}
return $manages[0]['children'];
}

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;
}