How to upload image in codeigniter?

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<form method="post" action="upload_image" enctype="multipart/form-data">
    <input type="file" name="userfile" />
    <input type="submit" value="Upload Image" />
</form>

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public function upload_image() {
    $config['upload_path'] = './uploads/'; // Set the upload path for the image
    $config['allowed_types'] = 'jpg|jpeg|png|gif'; // Set allowed image types
    $config['max_size'] = 1024; // Set max file size in KB

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

    if (!$this->upload->do_upload('userfile')) { // Check if image is uploaded successfully
        $error = array('error' => $this->upload->display_errors());
        print_r($error);
    } else {
        $data = array('upload_data' => $this->upload->data());
        print_r($data);
    }
}