php - cakephp 3 PDO 实例错误

Question

如果满足条件，我目前正在尝试向多名员工发送电子邮件；用户列表按预期获得，但是当我尝试 foreach 数组时，我总是得到这个“你不能序列化或反序列化 PDO 实例”错误。

这是我目前必须做的功能

function mailUsers() 
{
    $date = '03-07'; //date('m-d');
    $employee = $this->Employees->find()->where(['birthday LIKE' => '%' . $date . '%'])->toArray();
    var_dump($employee);

    foreach ($employee as $value) {
        $email = new Email();
        try {
            $email->reset();
            $email->from(['com@corp.co' => 'corp'])
                ->profile('SendGrid')
                ->to([$value['email'] => $value['full_name']])
                ->subject("test")
                ->emailFormat("both")
                ->template('default')
                ->send();
            $this->Flash->success("Success.");
        } catch (Exception $ex) {
            echo 'Exception : ', $ex->getMessage(), "\n";
        }
    }
}

任何帮助都感激不尽！