Codeigniter：数组到字符串转换错误

Question

这是我的模特：

public function count_diabetic(){
    $query = $this->db->query("Select count(diabetic) as count_diabetic from member where diabetic is not NULL");

    return $query->result_array();
} 

public function count_hypertensive(){
    $query = $this->db->query("Select count(hypertensive) as count_hypertensive from member where hypertensive is not NULL");

    return $query->result();
} 

这是我的控制器：

public function home(){
             $this->load->model('Jsv_model');
             $data = array(

                'count_diabetic' => $this->Jsv_model->count_diabetic(),
                'count_hypertensive' => $this->Jsv_model->count_hypertensive()

             ); 

             $this->session->set_userdata($data);   

            $this->load->view('home');
    }

这是我在php标签中的观点：

 echo $this->session->userdata('count_diabetic');

但是这里显示错误，该数组到字符串转换错误.. 请帮帮我

Answer 1

在PHP中，您可以使用print_r函数而不是echo来显示数组。

例如，您必须将代码更改为：

print_r($this->session->userdata['count_diabetic']);

Answer 2

在count_diabetic()内，您应该更改$query->result_array()

进入

$query->row()->count_diabetic，

它只返回计数而不是数组。

也可以count_hypertensive()。

Answer 3

你在这一行做错了。

srun

你应该怎么做？

echo $this->session->userdata('count_diabetic');