< div class =left_content> 
< div class =menu> 
<？php $ _helper = Mage :: helper（'catalog / category'）？> 
<？php $ _categories = $ _helper-> getStoreCategories（）？> 
<？php $ currentCategory = Mage :: registry（'current_category'）？> 
<？php if（count（$ _ categories）> 0）：？> 
< ul id =menu> 
<？php foreach（$ _ categories as $ _category）：？> 
< li class =sub> 
< a href =<？php echo $ _helper-> getCategoryUrl（$ _ category）？>><？php echo $ _category-> getName（）？>< /一个&GT; 
<？php $ _category = Mage :: getModel（'catalog / category'） - > load（$ _ category-> getId（））？> 
<？php $ _subcategories = $ _category-> getChildrenCategories（）？> 
<？php if（count（$ _ subcategories）> 0）：？> 
< ul> 
<？php foreach（$ _子类别为$ _subcategory）：？> 
< li> 
< a href =<？php echo $ _helper-> getCategoryUrl（$ _子类别）？>> 
<？php echo $ _subcategory-> getName（）？> 
<！ - 子子类别 - > 
<？php $ _subcategory = Mage :: getModel（'catalog / category'） - > load（$ _ subcategory-> getId（））？> 
<？php $ _subsubcategories = $ _subcategory-> getChildrenCategories（）？> 
<？php if（count（$ _ subsubcategories）> 0）：？> 
< ul> 
<？php foreach（$ _ subsubcategories as $ _subsubcategory）：？> 
< li> 
< a href =<？php echo $ _helper-> getCategoryUrl（$ _ subsubcategory）？>> 
<？php echo $ _subsubcategory-> getName（）？> 
< / a> 
< / li> 
<？php endforeach; ？&GT; 
< / ul> 
<？php endif; ？&GT; 
<！ - 子子类别 - > 
< / a> 
< / li> 
<？php endforeach; ？&GT; 
< / ul> 
<？php endif; ？&GT; 
< / li> 
<？php endforeach; ？&GT; 
< / ul> 
<？php endif; ？&GT; 
< / div> 

< / div> 
 

现在你应该没事了

I am working on a magento website that has a 2-level (category and subcategory) menu and I would like to add a 3rd level but I don't know how to get it working and I need help.

This is the code I have used to get the 1st and 2nd category levels, how can I get a 3rd level?

<div class="left_content">
 <div class="menu">
    <?php $_helper = Mage::helper('catalog/category') ?>
    <?php $_categories = $_helper->getStoreCategories() ?>
    <?php $currentCategory = Mage::registry('current_category') ?>
    <?php if (count($_categories) > 0): ?>
            <ul id="menu">
            <?php foreach($_categories as $_category): ?>
                    <li class="sub">
                    <a href="<?php echo $_helper->getCategoryUrl($_category) ?>"><?php echo $_category->getName() ?></a>
                    <?php $_category = Mage::getModel('catalog/category')->load($_category->getId()) ?>
                    <?php $_subcategories = $_category->getChildrenCategories() ?>
                    <?php if (count($_subcategories) > 0): ?>
                        <ul>
                        <?php foreach($_subcategories as $_subcategory): ?>
                            <li>
                                <a href="<?php echo $_helper->getCategoryUrl($_subcategory) ?>">
                                <?php echo $_subcategory->getName() ?>
                                </a>
                            </li>
                        <?php endforeach; ?>
                        </ul>
                    <?php endif; ?>
                    </li>
             <?php endforeach; ?>
            </ul>
    <?php endif; ?>
    </div>

</div>

<div class="left_content">
 <div class="menu">
    <?php $_helper = Mage::helper('catalog/category') ?>
    <?php $_categories = $_helper->getStoreCategories() ?>
    <?php $currentCategory = Mage::registry('current_category') ?>
    <?php if (count($_categories) > 0): ?>
            <ul id="menu">
            <?php foreach($_categories as $_category): ?>
                    <li class="sub">
                    <a href="<?php echo $_helper->getCategoryUrl($_category) ?>"><?php echo $_category->getName() ?></a>
                    <?php $_category = Mage::getModel('catalog/category')->load($_category->getId()) ?>
                    <?php $_subcategories = $_category->getChildrenCategories() ?>
                    <?php if (count($_subcategories) > 0): ?>
                        <ul>
                         <?php foreach($_subcategories as $_subcategory): ?>
                            <li>
                                <a href="<?php echo $_helper->getCategoryUrl($_subcategory) ?>">
                                <?php echo $_subcategory->getName() ?>
                                <!--sub sub category-->
                                <?php $_subcategory = Mage::getModel('catalog/category')->load($_subcategory->getId()) ?>
                                <?php $_subsubcategories = $_subcategory->getChildrenCategories() ?>
                                <?php if (count($_subsubcategories) > 0): ?>
                                 <ul>
                                 <?php foreach($_subsubcategories as $_subsubcategory): ?>
                                 <li>
                                    <a href="<?php echo $_helper->getCategoryUrl($_subsubcategory) ?>">
                                 <?php echo $_subsubcategory->getName() ?>
                                    </a>
                                 </li>
                          <?php endforeach; ?>
                        </ul>
                     <?php endif; ?>
                                 <!--sub sub category-->
                                </a>
                            </li>
                        <?php endforeach; ?>
                        </ul>
                    <?php endif; ?>
                    </li>
             <?php endforeach; ?>
            </ul>
    <?php endif; ?>
    </div>

</div>

Now it should be fine to you