php如何高效找出所有下级

php  /  管理员 发布于 7年前   555

PHP高效的取出所有下级：

递归取出所有下级：

<?php $data = [['uid' => 1,'username' => '155','parent_username' => '0'],['uid' => 2,'username' => '186','parent_username' => '155'],['uid' => 3,'username' => '189','parent_username' => '186'],['uid' => 4,'username' => '188','parent_username' => '155'],['uid' => 5,'username' => '187','parent_username' => '188'],['uid' => 6,'username' => '1898','parent_username' => '146'],]; /** * 获取所有下级 * [getTree description] * @param  [type] $data[description] * @param  string $parent_username [description] * @return [type]      [description] *///有层次，返回所有下级数据function getTree($data, $parent_username = '0'){    $arr = [];foreach($data as $key => $val){if($val['parent_username'] == $parent_username){$val['children'] = getTree($data, $val['username']);$arr[] = $val;}}return $arr;} //无层次，仅返回idfunction getTree($data, $parent_username = '0', $is_first_time = true){    static $arr = [];    if ($is_first_time) {        $arr = [];    }    foreach ($data as $key => $val) {        if ($val['parent_username'] == $parent_username) {$arr[]           = $val['uid'];getTree($data, $val['username'], false);        }    }    return $arr;} echo '<pre>';print_r(getTree($data));   ?>

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