Kirav

<div class="box">
  <div class="box-heading"><?php echo $heading_title; ?></div>
  <form action="<?php echo $post_action; ?>" method="post" enctype="multipart/form-data">
    <?php if ($poisk) { ?>
    <input type="text" name="poisk" value="<?php echo $poisk; ?>" />
    <?php } else { ?>
    <input type="text" name="poisk" value="<?php echo 'Введите значение'; ?>" onclick="this.value = '';" onkeydown="this.style.color = '#000000';" />
    <?php } ?>
    <?php foreach($articles as $article) { ?>
<?php if ($article['articles'] == $poisk) ?> value=<?php echo $article['articles']?> > <?php echo $article['articles'] ?>
<?php } ?>
    </form>
  <div class="box-content">
    <div class="box-category">
      <ul>
        <?php foreach ($articles as $article) { ?>
        <li>
          <?php if ($article['article_id'] == $article_id) { ?>
          <a href="<?php echo $article['href']; ?>" class="active"><?php echo $article['name']; ?></a>
          <?php } else { ?>
          <a href="<?php echo $article['href']; ?>"><?php echo $article['name']; ?></a>
          <?php } ?>
          <?php if ($article['children']) { ?>
          <ul>
            <?php foreach ($article['children'] as $child) { ?>
            <li>
              <?php if ($child['article_id'] == $child_id) { ?>
              <a href="<?php echo $child['href']; ?>" class="active"> - <?php echo $child['name']; ?></a>
              <?php } else { ?>
              <a href="<?php echo $child['href']; ?>"> - <?php echo $child['name']; ?></a>
              <?php } ?>
            </li>
            <?php } ?>
          </ul>
          <?php } ?>
        </li>
        <?php } ?>
      </ul>
    </div>
  </div>
</div>

контроллер

<?php
class ControllerModuleArticle extends Controller {
	protected function index($setting) {
		$this->language->load('module/article');

    	$this->data['heading_title'] = $this->language->get('heading_title');

		if (isset($this->request->get['id'])) {
			$parts = explode('_', (string)$this->request->get['id']);
		} else {
			$parts = array();
		}

		if (isset($parts[0])) {
			$this->data['article_id'] = $parts[0];
		} else {
			$this->data['article_id'] = 0;
		}

		if (isset($parts[1])) {
			$this->data['child_id'] = $parts[1];
		} else {
			$this->data['child_id'] = 0;
		}

  		$this->data['post_action'] = $this->url->link('catalog/article');
		$this->load->model('catalog/article');


		$this->data['articles'] = array();

		$articles = $this->model_catalog_article->getArticles(0);

 			    $this->data['articles'] = $articles;
			    $this->data['poisk'] = false;

		if (isset($this->request->get['poisk'])) {
			$this->data['poisk'] = $this->input->get['poisk'];
		} else {
			$this->data['poisk'] = '';
		}

//////////////////////// --------------

модель

<?php
class ModelCatalogArticle extends Model {
	public function getArticle($article_id) {
		return $this->getArticles((int)$article_id, 'by_id');
	}

	public function getArticles($id = 0, $type = 'by_parent') {

		static $data = null;

		if ($data === null) {
			$data = array();


			$sql = "SELECT * FROM " . DB_PREFIX . "article a LEFT JOIN " . DB_PREFIX . "article_description ad ON (a.article_id = ad.article_id) LEFT JOIN " . DB_PREFIX . "article_to_store a2s ON (a.article_id = a2s.article_id) WHERE ad.language_id = '" . (int)$this->config->get('config_language_id') . "' AND a2s.store_id = '" . (int)$this->config->get('config_store_id') . "' AND a.status = '1'";

			if (!empty($data['poisk'])) {
				$sql .= " AND LCASE(ad.name) LIKE '" . $this->db->escape(utf8_strtolower($data['poisk'])) . "%'";
			}
			$sql .= " ORDER BY a.parent_id, a.sort_order, ad.name";

			$query = $this->db->query($sql);

			foreach ($query->rows as $row) {
				$data['by_id'][$row['article_id']] = $row;
				$data['by_parent'][$row['parent_id']][] = $row;
			}
        }
        return ((isset($data[$type]) && isset($data[$type][$id])) ? $data[$type][$id] : array());
	}
///////////////////////////////////-----------------------------------------