Trying to get str_replace working in custom Magento code - php

Question

Here is my code:
<?php
$_rtl = Mage::getStoreConfig('custom_menu/general/rtl') + 0;
$_categories = $this->getStoreCategories();
if (is_object($_categories)) $_categories = $this->getStoreCategories()->getNodes();
?>
<div class="nav-container">
<div style="z-index:999;position:relative;top:-8px;left:979px;cursor:pointer;"><img src="<?php echo $this->getSkinUrl('images/Truck-Prince-text.png'); ?>" height="91" width="123" style="position:absolute;" onclick="location.href='<?php echo Mage::getUrl('checkout/cart'); ?>'"></div>
<div id="custommenu" class="<?php echo $_rtl ? ' rtl' : ''; ?>">
<?php if ($this->showHomeLink()) : ?>
<div class="menu">
<div class="parentMenu menu0">
<a href="<?php echo $this->getUrl('') ?>">
<span><?php echo $this->__('Home'); ?></span>
</a>
</div>
</div>
<?php endif ?>
<?php foreach ($_categories as $_category): ?>
<?php echo $this->drawCustomMenuItem($_category) ?>
<?php endforeach ?>
<?php echo $this->getLayout()->createBlock('cms/block')->setBlockId('nav-links-after')->toHtml() ?>
<div class="clearBoth"></div>
</div>
</div>
What I want to do is something like this but I don't know how to insert this in without causing errors. I basically want to change the existing url with the string replaced urls..
<?php // We must replace URLs on the fly to use landing pages and not break subcat navigation
$_category = str_replace('wild-bird-feed-supplies.html', 'landing-wild-bird-feed-supplies', $_category);
$_category = str_replace('lawn-garden-supplies.html', 'landing-lawn-garden-supplies', $_category);
$_category = str_replace('pet-food-supplies.html', 'landing-pet-food-supplies', $_category);
$_category = str_replace('animal-feed-supplies.html', 'landing-animal-feed-supplies', $_category); ?>

Answer 1

I finally was able to get it :) Here is what I did...
<?php
$_rtl = Mage::getStoreConfig('custom_menu/general/rtl') + 0;
$_categories = $this->getStoreCategories();
if (is_object($_categories)) $_categories = $this->getStoreCategories()->getNodes();
?>
<div class="nav-container">
<div style="z-index:999;position:relative;top:-8px;left:979px;cursor:pointer;"><img src="<?php echo $this->getSkinUrl('images/Truck-Prince-text.png'); ?>" height="91" width="123" style="position:absolute;" onclick="location.href='<?php echo Mage::getUrl('checkout/cart'); ?>'"></div>
<div id="custommenu" class="<?php echo $_rtl ? ' rtl' : ''; ?>">
<?php if ($this->showHomeLink()) : ?>
<div class="menu">
<div class="parentMenu menu0">
<a href="<?php echo $this->getUrl('') ?>">
<span><?php echo $this->__('Home'); ?></span>
</a>
</div>
</div>
<?php endif ?>
<?php foreach ($_categories as $_category): ?>
<?php $_category = $this->drawCustomMenuItem($_category) ?>
<?php // We must replace URLs on the fly to use landing pages and not break subcat navigation
$_category = str_replace('wild-bird-feed-supplies.html', 'landing-wild-bird-feed-supplies', $_category);
$_category = str_replace('lawn-garden-supplies.html', 'landing-lawn-garden-supplies', $_category);
$_category = str_replace('pet-food-supplies.html', 'landing-pet-food-supplies', $_category);
$_category = str_replace('animal-feed-supplies.html', 'landing-animal-feed-supplies', $_category); ?>
<?php echo $_category; ?>
<?php endforeach ?>
<?php echo $this->getLayout()->createBlock('cms/block')->setBlockId('nav-links-after')->toHtml() ?>
<div class="clearBoth"></div>
</div>
</div>