如何在数据库codeigniter框架中插入复选框数据

CREATE TABLE users (
  id INT(11) AUTO_INCREMENT PRIMARY KEY,
  name VARCHAR(50),
  hobbies VARCHAR(255)
);

<form method="post" action="<?php echo base_url('controller/insert_data'); ?>">
  <label for="name">姓名：</label>
  <input type="text" name="name" id="name" required>

  <label for="hobbies">兴趣爱好：</label>
  <input type="checkbox" name="hobbies[]" value="篮球">篮球
  <input type="checkbox" name="hobbies[]" value="足球">足球
  <input type="checkbox" name="hobbies[]" value="游泳">游泳

  <input type="submit" value="提交">
</form>

public function insert_data() {
  $this->load->library('form_validation');

  // 表单验证规则
  $this->form_validation->set_rules('name', '姓名', 'required');
  $this->form_validation->set_rules('hobbies[]', '兴趣爱好', 'required');

  if ($this->form_validation->run() == FALSE) {
    // 表单验证失败，显示错误信息
    $this->load->view('form');
  } else {
    // 表单验证通过，插入数据到数据库
    $name = $this->input->post('name');
    $hobbies = implode(',', $this->input->post('hobbies'));

    $data = array(
      'name' => $name,
      'hobbies' => $hobbies
    );

    $this->db->insert('users', $data);

    // 插入成功后的操作
    redirect('controller/success');
  }
}

public function insert_data() {
  // ...

  if ($this->form_validation->run() == FALSE) {
    // ...
  } else {
    // ...

    $this->db->insert('users', $data);

    // ...
  }
}