PHP使用引用实现无限极分类

PHP实现无限极分类

引用

<?PHP
public function buildTree($list, $pk='id', $pid='pid', $child='_child', $root=0){
  
    $tree = array();
    $packData = array();
    foreach ($list as $data) {
        $packData[$data[$pk]] = $data;
    }

    foreach ($packData as $key=>$val){
        if($val[$pid] == $root){
            $tree[] = &$packData[$key];
        }else{
            $packData[$val[$pid]][$child][] = &$packData[$key];
        }
    }

    return $tree;
}