Yii2框架 常用函数整合

1.使用事务添加数据：

   public function create()
    {
        if($this->validate()) {
            $trans = Yii::$app->db->beginTransaction();
            $admin = new Admin();
            try {
                $admin->setAttributes($this->getAttributes());
                $admin->status = Admin::STATUS_ACTIVED;
                $admin->password_hash = Yii::$app->security->generatePasswordHash($this->password);
                $admin->created_at = time();
                $admin->updated_at = time();
                $admin->profile_id = $this->createProfile()->id;
                if($admin->save()) {
                    $trans->commit();
                    return true;
                }

                $error = '';
                foreach ($admin->errors as $es) {
                    foreach ($es as $e) {
                        $error .= ($e."<br />");
                    }
                }
                Yii::$app->session->setFlash('error', $error);
                return false;
            } catch (Exception $e) {
                Yii::$app->session->setFlash('error', $e->getMessage());
                $trans->rollBack();
                return false;
            }
        } else {
            $error = '';
            foreach ($this->errors as $es) {
                foreach ($es as $e) {
                    $error .= ($e."<br />");
                }
            }
            Yii::$app->session->setFlash('error', $error);
            return false;
        }

    }

　　2.分类的集合管理类：

class Category {
    // 组合一维数组
    static public function unlimitedForLevel ($cate, $parent='pid', $html = '----', $suffix = '|', $pid = null, $level = 0) {
        $arr = array();
        foreach ($cate as $v){
            if($v[$parent] == $pid){
                $v['level'] = $level + 1;
                $v['prefix'] = str_repeat($html, $level) . ($level ? $suffix : '');
                $arr[] = $v;
                $arr = array_merge($arr, self::unlimitedForLevel($cate, $parent, $html, $suffix, $v['id'], $level + 1));
            }
        }
        return $arr;
    }

    // 组合多位数组
    static public function unlimitedForLayer($cate,$name='child', $pid = 0) {
        $arr = array();
        foreach ($cate as $v){
            if($v['pid'] == $pid){
                $v[$name] = self::unlimitedForLayer($cate, $name, $v['id']);
                $arr[] = $v;
            }
        }
        return $arr;
    }

    // 传递一个子分类ID返回所有的父级分类
    static public function getParents($cate, $id){
        $arr = array();
        foreach ($cate as $v){
            if($v['id'] == $id){
                $arr[] = $v;
                $arr = array_merge(self::getParents($cate, $v['pid']), $arr);
            }
        }
        return $arr;
    }

    // 传递一个父级分类ID返回所有的子级分类
    static public function getChilds($cate, $pid, $name='child'){
        $arr = array();
        foreach ($cate as $v){
            if($v['pid'] == $pid){
                $v[$name] = self::getChilds($cate, $v['id'], $name);
                $arr[] = $v;
            }
        }
        return $arr;
    }

    // 传递一个父级分类ID返回所有的子级ID
    static public function getChildsId($cate, $pid){
        $arr = array();
        foreach ($cate as $v) {
            if($v['pid'] == $pid){
                $arr[] = $v['id'];
                $arr = array_merge($arr, self::getChildsId($cate, $v['id']));
            }
        }
        return $arr;
    }
}