How to upload multiple image with validation in codeigniter?

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<form action="upload_images" method="post" enctype="multipart/form-data">
    <input type="file" name="images[]" multiple>
    <input type="submit" value="Upload">
</form>

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public function upload_images() {
    $config['upload_path'] = './uploads/';
    $config['allowed_types'] = 'gif|jpg|jpeg|png';
    $config['max_size'] = 2048; // 2MB

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

    if (!$this->upload->do_upload('images')) {
        $error = array('error' => $this->upload->display_errors());
        $this->load->view('upload_form', $error);
    } else {
        $data = array('upload_data' => $this->upload->data());
        $this->load->view('upload_success', $data);
    }
}

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$this->load->library('form_validation');
$this->form_validation->set_rules('images[]', 'Images', 'callback_validate_images');

public function validate_images($images) {
    foreach ($images['name'] as $key => $value) {
        if (!empty($value)) {
            $this->form_validation->set_rules('images['.$key.']', 'Image', 'callback_validate_image['.$key.']');
        }
    }
    return $this->form_validation->run();
}

public function validate_image($image, $key) {
    if ($_FILES['images']['size'][$key] > 2048) {
        $this->form_validation->set_message('validate_image', 'The %s size should be less than 2MB.');
        return false;
    } else {
        return true;
    }
}

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<p>Images uploaded successfully!</p>