CodeIgniter上传图像无输入

$config['upload_path'] = './uploads/';  // 设置上传文件的保存路径
$config['allowed_types'] = 'gif|jpg|png';  // 设置允许上传的文件类型
$config['max_size'] = 2048;  // 设置允许上传的最大文件大小（单位为KB）
$config['max_width'] = 0;  // 设置允许上传的最大图片宽度（0表示不限制）
$config['max_height'] = 0;  // 设置允许上传的最大图片高度（0表示不限制）

public function upload_image()
{
    $config['upload_path'] = './uploads/';
    $config['allowed_types'] = 'gif|jpg|png';
    $config['max_size'] = 2048;
    $config['max_width'] = 0;
    $config['max_height'] = 0;

    $this->load->library('upload', $config);

    if (!$this->upload->do_upload('image')) {
        $error = $this->upload->display_errors();
        // 处理上传失败的情况
    } else {
        $data = $this->upload->data();
        $file_path = $data['full_path'];
        // 处理上传成功的情况
    }
}

<form method="post" action="your_controller/upload_image" enctype="multipart/form-data">
    <input type="file" name="image">
    <input type="submit" value="上传">
</form>