PHP遞迴實現無限級分類

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$datasection = array(    array('id' => 1, 'name' => '安徽', 'pid' => 0),    array('id' => 2, 'name' => '北京', 'pid' => 0),    array('id' => 3, 'name' => '海澱', 'pid' => 2),    array('id' => 4, 'name' => '中關村', 'pid' => 3),    array('id' => 5, 'name' => '合肥', 'pid' => 1),    array('id' => 6, 'name' => '上地', 'pid' => 3),    array('id' => 7, 'name' => '河北', 'pid' => 0),    array('id' => 8, 'name' => '石家莊', 'pid' => 7),        );function getTree($data, $pId){$tree = '';foreach($data as $k => $v){if($v['pid'] == $pId){$v['pid'] = getTree($data, $v['id']);$tree[] = $v;unset($data[$k]);}}return $tree;}$tree = getTree($datasection, 0);print_r($tree);