上传文件时，我只得到数组中的第一个图像，我想要array.Using Codeigniter中的所有图像

<input type="file" name="userfiles[]" multiple>

// 加载文件上传库
$this->load->library('upload');

// 配置上传设置
$config['upload_path'] = './uploads/';
$config['allowed_types'] = 'gif|jpg|png';
$config['max_size'] = 1024;

// 初始化上传类
$this->upload->initialize($config);

// 循环处理上传的每个文件
foreach ($_FILES['userfiles']['name'] as $key => $filename) {
    $_FILES['userfile']['name'] = $_FILES['userfiles']['name'][$key];
    $_FILES['userfile']['type'] = $_FILES['userfiles']['type'][$key];
    $_FILES['userfile']['tmp_name'] = $_FILES['userfiles']['tmp_name'][$key];
    $_FILES['userfile']['error'] = $_FILES['userfiles']['error'][$key];
    $_FILES['userfile']['size'] = $_FILES['userfiles']['size'][$key];

    // 执行文件上传
    if ($this->upload->do_upload('userfile')) {
        // 文件上传成功
        $data = $this->upload->data();
        // 处理上传成功的文件
        // ...
    } else {
        // 文件上传失败
        $error = $this->upload->display_errors();
        // 处理上传失败的文件
        // ...
    }
}