PHP无限极分类

public function getCategoryTree($pid=0,$t=-1) ???{ ???????$t++; ???????static $cat_temp; ???????$data = M(‘keywords_categroy‘)->findAll(array(‘pid‘=>$pid),‘id ASC, category‘); ???????if(!empty($data)) ???????{ ???????????foreach ($data as $key => $val ) ???????????{ ???????????????$val[‘category‘] = str_repeat(‘ ‘,$t*3).‘├‘.$val[‘category‘]; ???????????????$val[‘level‘] = $t+1; ???????????????$cat_temp[] = $val; ???????????????$this -> getCategoryTree($val[‘id‘],$t); ???????????} ???????} ???????return $cat_temp; ???}