PHP不使用递归的无限级分类简单实例

不用递归实现无限级分类，简单测试了下性能比递归稍好一点点点，但写得太复杂了，还是递归简单方便点

代码：

<?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'];
}

递归实现

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;
}

以上这篇PHP不使用递归的无限级分类简单实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持三水点靠木。