PHP不使用遞歸的無限級分類簡單實例

更新時間：2016年11月05日 15:48:02 投稿：jingxian

下面小編就為大家?guī)硪黄狿HP不使用遞歸的無限級分類簡單實例。小編覺得挺不錯的，現(xiàn)在就分享給大家，也給大家做個參考。一起跟隨小編過來看看吧

不用遞歸實現(xiàn)無限級分類，簡單測試了下性能比遞歸稍好一點點點，但寫得太復(fù)雜了，還是遞歸簡單方便點

代碼：

<?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 $m) {
      // 存在子欄目的進(jìn)行轉(zhuǎn)移
      if (isset($manages[$m[1]])) {
        $manages[$m[0]]['children'][$m[1]] = $manages[$m[1]];
        $manages[$m[1]] = null;
        unset($manages[$m[1]]);
      }
    }
  }
  return $manages[0]['children'];
}

遞歸實現(xiàn)

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;
}

以上這篇PHP不使用遞歸的無限級分類簡單實例就是小編分享給大家的全部內(nèi)容了，希望能給大家一個參考，也希望大家多多支持腳本之家。

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