想要magento站点搜索加上分类选项，只需要在magento相应的模板中，用以下代码替换app/design/你的主题名/template/catalogsearch/form.mini.phtml文件中的源代码即可。然后刷新索引和缓存，你将会发现搜索的旁边出来一个分类选项！

<?php
        $category = Mage::getModel('catalog/category');
        if(is_object(Mage::registry('current_category'))){
            $current_category_path=Mage::registry('current_category')->getPathIds();
        }else{
            $current_category_path = array();
        }
        $category->load(Mage::app()->getStore()->getRootCategoryId());
        $children_string = $category->getChildren();
        $children = explode(',',$children_string);
        $extra_options='';
        foreach($children as $c){
            $selected = (in_array($c, $current_category_path))?'SELECTED':'';
            $extra_options.= '<option value="' . $c . '" ' . $selected . '>' . $category->load($c)->getName() . '</option>' . "\n";
        }
        ?>
        <form id="search_mini_form" action="<?php echo $this->helper('catalogSearch')->getResultUrl() ?>" method="get">
            <fieldset>
                <legend><?php echo $this->__('Search Site') ?></legend>
                <div class="mini-search">
                    <input id="search" type="text" class="input-text" name="<?php echo $this->helper('catalogSearch')->getQueryParamName() ?>" value="<?php echo $this->helper('catalogSearch')->getEscapedQueryText() ?>" />
                    <select name="cat" id="cat" class="input-text">
                    <option value="">All Departments</option>
                    <?= $extra_options ?>
                   </select>
                    <input type="submit" value="Go" style="border: 1px solid #808080;" alt="<?php echo $this->__('Search') ?>" />
                    <div id="search_autocomplete" class="search-autocomplete"></div>
                    <script type="text/javascript">
                    //<![CDATA[
                        var searchForm = new Varien.searchForm('search_mini_form', 'search', '<?php echo $this->__('search site...') ?>');
                        searchForm.initAutocomplete('<?php echo $this->helper('catalogSearch')->getSuggestUrl() ?>', 'search_autocomplete');
                    //]]>
                    </script>
                </div>
            </fieldset>
        </form>