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PHP efficiently removes all subordinates:
Recursively removes all subordinates:
<?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 $arr; } //无层次,仅返回id function getTree($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 $arr; } echo '<pre class="brush:php;toolbar:false">'; print_r(getTree($data)); ?>
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