Month: March 2018

Magento

Magento Code Snippets

07/03/2018 by
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Download extension manually using pear/mage

Pear for 1.4, mage for 1.5. File downloaded into /downloader/.cache/community/

./pear download magento-community/Shipping_Agent
./mage download community Shipping_Agent

Clear cache/reindex

<?php
// clear cache
Mage::app()->removeCache('catalog_rules_dirty');
// reindex prices
Mage::getModel('index/process')->load(2)->reindexEverything();
/*
1 = Product Attributes
2 = Product Attributes
3 = Catalog URL Rewrites
4 = Product Flat Data
5 = Category Flat Data
6 = Category Products
7 = Catalog Search Index
8 = Tag Aggregation Data
9 = Stock Status
*/
?>

Load category by id

<?php
$_category = Mage::getModel('catalog/category')->load(89);
$_category_url = $_category->getUrl();
?>

Load product by id or sku

<?php
$_product_1 = Mage::getModel('catalog/product')->load(12); // won't include a valid stock item
$_product_2 = Mage::getModel('catalog/product')->loadByAttribute('sku','cordoba-classic-6-String-guitar'); // will include a valid stock item
?>

Get Configurable product’s Child products

<?php
// input is $_product and result is iterating child products
$childProducts = Mage::getModel('catalog/product_type_configurable')->getUsedProducts(null, $product);
?>

Get Configurable product’s Children’s (simple product) custom attributes

<?php
// input is $_product and result is iterating child products
$conf = Mage::getModel('catalog/product_type_configurable')->setProduct($_product);
$col = $conf->getUsedProductCollection()->addAttributeToSelect('*')->addFilterByRequiredOptions();
foreach($col as $simple_product){
	var_dump($simple_product->getId());
}
?>

Log to custom file

<?php Mage::log('Your Log Message', Zend_Log::INFO, 'your_log_file.log'); ?>

Call Static Block

<?php echo $this->getLayout()->createBlock('cms/block')->setBlockId('block-name')->toHtml(); ?>

Add JavaScript to page

First approach: page.xml – you can add something like

<action method="addJs"><script>path/to/my/file.js</script></action>

Second approach: Find page/html/head.phtml in your theme and add the code directly to page.html.

Third approach: If you look at the stock page.html mentioned above, you’ll see this line

<?php echo $this->getChildHtml() ?>

Normally, the getChildHtml method is used to render a specific child block. However, if called with no paramater, getChildHtml will automatically render all the child blocks. That means you can add something like

<!-- existing line --> <block type="page/html_head" name="head" as="head">
	<!-- new sub-block you're adding --> <block type="core/template" name="mytemplate" as="mytemplate" template="page/mytemplate.phtml"/>
	...

to page.xml, and then add the mytemplate.phtml file. Any block added to the head block will be automatically rendered. (this automatic rendering doesn’t apply for all layout blocks, only for blocks where getChildHtml is called without paramaters).

Check if customer is logged in

<?php $logged_in = Mage::getSingleton('customer/session')->isLoggedIn(); // (boolean) ?>

Get the current category/product/cms page

<?php
$currentCategory = Mage::registry('current_category');
$currentProduct = Mage::registry('current_product');
$currentCmsPage = Mage::registry('cms_page');
?>

Run Magento Code Externally

<?php
require_once('app/Mage.php'); //Path to Magento
umask(0);
Mage::app();
// Run you code here
?>

Programmatically change Magento’s core config data

<?php
// find 'path' in table 'core_config_data' e.g. 'design/head/demonotice'
$my_change_config = new Mage_Core_Model_Config();
// turns notice on
$my_change_config->saveConfig('design/head/demonotice', "1", 'default', 0);
// turns notice off
$my_change_config->saveConfig('design/head/demonotice', "0", 'default', 0);
?>

Changing the Admin URL

Open up the /app/etc/local.xml file, locate the <frontName> tag, and change the ‘admin’ part it to something a lot more random, eg:

<frontName><![CDATA[supersecret-admin-name]]></frontName>

Clear your cache and sessions.

Magento: Mass Exclude/Unexclude Images

By default, Magento will check the ‘Exclude’ box for you on all imported images, making them not show up as a thumbnail under the main product image on the product view.

# Mass Unexclude
UPDATE`catalog_product_entity_media_gallery_value` SET `disabled` = '0' WHERE `disabled` = '1';
# Mass Exclude
UPDATE`catalog_product_entity_media_gallery_value` SET `disabled` = '1' WHERE `disabled` = '0';

getBaseUrl – Magento URL Path

<?php
// http://example.com/
echo Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_WEB);
// http://example.com/js/
echo Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_JS);
// http://example.com/index.php/
echo Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_LINK);
// http://example.com/media/
echo Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_MEDIA);
// http://example.com/skin/
echo Mage::getBaseUrl(Mage_Core_Model_Store::URL_TYPE_SKIN);
?>

Get The Root Category In Magento

<?php
$rootCategoryId = Mage::app()->getStore()->getRootCategoryId();
$_category = Mage::getModel('catalog/category')->load($rootCategoryId);
// You can then get all of the top level categories using:
$_subcategories = $_category->getChildrenCategories();
?>

Get The Current URL In Magento

<?php echo Mage::helper('core/url')->getCurrentUrl(); ?>

Category Navigation Listings in Magento

Make sure the block that you’re working is of the type catalog/navigation. If you’re editing catalog/navigation/left.phtml then you should be okay.

<div id="leftnav">
	<?php $helper = $this->helper('catalog/category') ?>
	<?php $categories = $this->getStoreCategories() ?>
	<?php if (count($categories) > 0): ?>
		<ul id="leftnav-tree" class="level0">
			<?php foreach($categories as $category): ?>
				<li class="level0<?php if ($this->isCategoryActive($category)): ?> active<?php endif; ?>">
					<a href="<?php echo $helper->getCategoryUrl($category) ?>"><span><?php echo $this->escapeHtml($category->getName()) ?></span></a>
					<?php if ($this->isCategoryActive($category)): ?>
						<?php $subcategories = $category->getChildren() ?>
						<?php if (count($subcategories) > 0): ?>
							<ul id="leftnav-tree-<?php echo $category->getId() ?>" class="level1">
								<?php foreach($subcategories as $subcategory): ?>
									<li class="level1<?php if ($this->isCategoryActive($subcategory)): ?> active<?php endif; ?>">
										<a href="<?php echo $helper->getCategoryUrl($subcategory) ?>"><?php echo $this->escapeHtml(trim($subcategory->getName(), '- ')) ?></a>
									</li>
								<?php endforeach; ?>
							</ul>
							<script type="text/javascript">decorateList('leftnav-tree-<?php echo $category->getId() ?>', 'recursive')</script>
						<?php endif; ?>
					<?php endif; ?>
				</li>
			<?php endforeach; ?>
		</ul>
		<script type="text/javascript">decorateList('leftnav-tree', 'recursive')</script>
	<?php endif; ?>
</div>

Debug using zend

<?php echo Zend_Debug::dump($thing_to_debug, 'debug'); ?>

$_GET, $_POST & $_REQUEST Variables

<?php
// $_GET
$productId = Mage::app()->getRequest()->getParam('product_id');
// The second parameter to getParam allows you to set a default value which is returned if the GET value isn't set
$productId = Mage::app()->getRequest()->getParam('product_id', 44);
$postData = Mage::app()->getRequest()->getPost();
// You can access individual variables like...
$productId = $postData['product_id']);
?>

Get methods of an object

First, use get_class to get the name of an object’s class.

<?php $class_name = get_class($object); ?>

Then, pass that get_class_methods to get a list of all the callable methods on an object

<?php
$class_name = get_class($object);
$methods = get_class_methods($class_name);
foreach($methods as $method)
{
	var_dump($method);
}
?>

Is product purchasable?

<?php if($_product->isSaleable()) { // do stuff } ?>

Load Products by Category ID

<?php
$_category = Mage::getModel('catalog/category')->load(47);
$_productCollection = $_category->getProductCollection();
if($_productCollection->count()) {
	foreach( $_productCollection as $_product ):
		echo $_product->getProductUrl();
		echo $this->getPriceHtml($_product, true);
		echo $this->htmlEscape($_product->getName());
	endforeach;
}
?>

Update all subscribers into a customer group (e.g. 5)

UPDATE
	customer_entity,
	newsletter_subscriber
SET
	customer_entity.`group_id` = 5
WHERE
	customer_entity.`entity_id` = newsletter_subscriber.`customer_id`
AND
	newsletter_subscriber.`subscriber_status` = 1;

Get associated products

In /app/design/frontend/default/site/template/catalog/product/view/type/

<?php $_helper = $this->helper('catalog/output'); ?>
<?php $_associatedProducts = $this->getAllowProducts() ?>
<?php //var_dump($_associatedProducts); ?>
<br />
<br />
<?php if (count($_associatedProducts)): ?>
	<?php foreach ($_associatedProducts as $_item): ?> 
		<a href="<?php echo $_item->getProductUrl() ?>"><?php echo $_helper->productAttribute($_item, $_item->getName(), 'name') ?> | <?php echo $_item->getName() ?> | <?php echo $_item->getPrice() ?></a>
		<br />
		<br />
	<?php endforeach; ?>
<?php endif; ?>

Get An Array of Country Names/Codes in Magento

<?php
$countryList = Mage::getResourceModel('directory/country_collection')
                    ->loadData()
                    ->toOptionArray(false);
     
    echo '<pre>';
    print_r( $countryList);
    exit('</pre>');
?>

Create a Country Drop Down in the Frontend of Magento

<?php
$_countries = Mage::getResourceModel('directory/country_collection')
                                    ->loadData()
                                    ->toOptionArray(false) ?>
<?php if (count($_countries) > 0): ?>
    <select name="country" id="country">
        <option value="">-- Please Select --</option>
        <?php foreach($_countries as $_country): ?>
            <option value="<?php echo $_country['value'] ?>">
                <?php echo $_country['label'] ?>
            </option>
        <?php endforeach; ?>
    </select>
<?php endif; ?>

Create a Country Drop Down in the Magento Admin

<?php
    $fieldset->addField('country', 'select', array(
        'name'  => 'country',
        'label'     => 'Country',
        'values'    => Mage::getModel('adminhtml/system_config_source_country')->toOptionArray(),
    ));
?>

Return Product Attributes

<?php
$_product->getThisattribute();
$_product->getAttributeText('thisattribute');
$_product->getResource()->getAttribute('thisattribute')->getFrontend()->getValue($_product);
$_product->getData('thisattribute');
// The following returns the option IDs for an attribute that is a multiple-select field: 
$_product->getData('color'); // i.e. 456,499
// The following returns the attribute object, and instance of Mage_Catalog_Model_Resource_Eav_Attribute: 
$_product->getResource()->getAttribute('color'); // instance of Mage_Catalog_Model_Resource_Eav_Attribute
// The following returns an array of the text values for the attribute: 
$_product->getAttributeText('color') // Array([0]=>'red', [1]=>'green')
// The following returns the text for the attribute
if ($attr = $_product->getResource()->getAttribute('color')):
    echo $attr->getFrontend()->getValue($_product); // will display: red, green
endif;
?>

Cart Data

<?php
$cart = Mage::getModel('checkout/cart')->getQuote()->getData();
print_r($cart);
$cart = Mage::helper('checkout/cart')->getCart()->getItemsCount();
print_r($cart);
$session = Mage::getSingleton('checkout/session');
foreach ($session->getQuote()->getAllItems() as $item) {
    echo $item->getName();
    Zend_Debug::dump($item->debug());
}
?>

Get Simple Products of a Configurable Product

<?php
if($_product->getTypeId() == "configurable") {
    $ids = $_product->getTypeInstance()->getUsedProductIds();
?>
<ul>
    <?php
    foreach ($ids as $id) {
        $simpleproduct = Mage::getModel('catalog/product')->load($id);
    ?>
        <li>
        	<?php
        	echo $simpleproduct->getName() . " - " . (int)Mage::getModel('cataloginventory/stock_item')->loadByProduct($simpleproduct)->getQty();
        	?>
        </li>				
    <?php
    }
    ?>
</ul>
<?php
}
?>

Turn template hints on/off via database

UPDATE
`core_config_data`
SET
`value` = 0
WHERE
`path` = "dev/debug/template_hints"
OR
`path` = "dev/debug/template_hints_blocks";

Delete all products

TRUNCATE TABLE `catalog_product_bundle_option`;
TRUNCATE TABLE `catalog_product_bundle_option_value`;
TRUNCATE TABLE `catalog_product_bundle_selection`;
TRUNCATE TABLE `catalog_product_entity_datetime`;
TRUNCATE TABLE `catalog_product_entity_decimal`;
TRUNCATE TABLE `catalog_product_entity_gallery`;
TRUNCATE TABLE `catalog_product_entity_int`;
TRUNCATE TABLE `catalog_product_entity_media_gallery`;
TRUNCATE TABLE `catalog_product_entity_media_gallery_value`;
TRUNCATE TABLE `catalog_product_entity_text`;
TRUNCATE TABLE `catalog_product_entity_tier_price`;
TRUNCATE TABLE `catalog_product_entity_varchar`;
TRUNCATE TABLE `catalog_product_link`;
TRUNCATE TABLE `catalog_product_link_attribute_decimal`;
TRUNCATE TABLE `catalog_product_link_attribute_int`;
TRUNCATE TABLE `catalog_product_link_attribute_varchar`;
TRUNCATE TABLE `catalog_product_option`;
TRUNCATE TABLE `catalog_product_option_price`;
TRUNCATE TABLE `catalog_product_option_title`;
TRUNCATE TABLE `catalog_product_option_type_price`;
TRUNCATE TABLE `catalog_product_option_type_title`;
TRUNCATE TABLE `catalog_product_option_type_value`;
TRUNCATE TABLE `catalog_product_super_attribute`;
TRUNCATE TABLE `catalog_product_super_attribute_label`;
TRUNCATE TABLE `catalog_product_super_attribute_pricing`;
TRUNCATE TABLE `catalog_product_super_link`;
TRUNCATE TABLE `catalog_product_enabled_index`;
TRUNCATE TABLE `catalog_product_website`;
TRUNCATE TABLE `catalog_product_entity`;
TRUNCATE TABLE `cataloginventory_stock_item`;
TRUNCATE TABLE `cataloginventory_stock_status`;

Getting Configurable Product from Simple Product ID in Magento 1.5+

<?php
$simpleProductId = 465;
$parentIds = Mage::getResourceSingleton('catalog/product_type_configurable')
    ->getParentIdsByChild($simpleProductId);
$product = Mage::getModel('catalog/product')->load($parentIds[0]);
echo $product->getId(); // ID = 462 (aka, Parent of 465)
?>

Create a category using parent id

<?php
/* supply parent id */
$parentId = '10';
 
$category = new Mage_Catalog_Model_Category();
$category->setName('Storybloks');
$category->setUrlKey('new-category');
$category->setIsActive(1);
$category->setDisplayMode('PRODUCTS');
$category->setIsAnchor(0);
 
$parentCategory = Mage::getModel('catalog/category')->load($parentId);
$category->setPath($parentCategory->getPath());               
 
$category->save();
unset($category);
?>

Create a category within another category, which you know by name

<?php
$parentId = null;

$collection = Mage::getModel('catalog/category')->getCollection()
->setStoreId('0')
->addAttributeToSelect('name')
->addAttributeToSelect('is_active');
foreach ($collection as $cat) {
    if ($cat->getName() == 'Storybloks Parent Category') {
        $parentId = $cat->getId();
        break;
    }
}
 
if ($parentId) {
 
    $urlKey = 'new-category';
 
    $currentCategory = Mage::getModel('catalog/category')->getCollection()
        ->addFieldToFilter('url_key', $urlKey)
        ->setCurPage(1)
        ->setPageSize(1)
        ->getFirstItem();
 
    if (!($currentCategory && $currentCategory->getId())) {
        $category = Mage::getModel('catalog/category');
        $category->setName('Storybloks Subcategory')
        ->setUrlKey($urlKey)
        ->setIsActive(1)
        ->setDisplayMode('PRODUCTS')
        ->setIsAnchor(0)
        ->setDescription('This is a storybloks subcategory')
        ->setCustomDesignApply(1)
        ->setCustomDesign('storybloks/new-category-style') /* create this template and layout
                                                                                 in your design directory */
        ->setAttributeSetId($category->getDefaultAttributeSetId());
 
        $parentCategory = Mage::getModel('catalog/category')->load($parentId);
        $category->setPath($parentCategory->getPath());               
 
        $category->save();
        unset($category);
    }
}
?>

Add a new category or update existing

<?php
function createCategory($data, $parentId=false, $storeId=false)
{
	echo "create category {$data['name']}\n";

	$category = Mage::getModel('catalog/category')->loadByAttribute('name', $data['name']);

	if (!$storeId)
	{
		$storeId = Mage_Core_Model_App::ADMIN_STORE_ID;
	}

	if (!$parentId)
	{
		$parentId = Mage_Catalog_Model_Category::TREE_ROOT_ID;
		
		if ($storeId) 
		{
			$parentId = Mage::app()->getStore($storeId)->getRootCategoryId();
		}
	}

	if (!$category)
	{
		$category = new Mage_Catalog_Model_Category();
		
		$parentCategory = Mage::getModel('catalog/category')->load($parentId);
		$category->setPath($parentCategory->getPath());
	}

	$category->setName($data['name']);
	$category->setUrlKey(isset($data['urlKey']) ? $data['urlKey'] : $data['name']);
	$category->setIsActive(isset($data['isActive']) ? $data['isActive'] : 1);
	$category->setDisplayMode('PRODUCTS_AND_PAGE');
	$category->setIsAnchor(0);

	try 
	{
		$category->save();
		echo "Success\n";
		return $category->getId();
	}
	catch (Exception $e)
	{
		echo "Exception: ".$e->getMessage()."\n";
	}
		
	return false;
}
?>

Add a new product or update existing

<?php
function createProduct($data)
{
	echo "create product {$data['name']} {$data['price']}\n";

	$product = Mage::getModel('catalog/product')->loadByAttribute('sku', $data['sku']); 

	if (!$product)
	{
		$product = new Mage_Catalog_Model_Product();
 
		$product->setTypeId('simple');
		$product->setWeight(1.0000);
		$product->setVisibility(Mage_Catalog_Model_Product_Visibility::VISIBILITY_BOTH);
		$product->setStatus(1);
		$product->setSku($data['sku']);
		$product->setTaxClassId(0);
		$product->setWebsiteIDs(array(1));
		$product->setStoreIDs(array(1));
			
		$product->setStockData
		(
			array
			(
				'is_in_stock'   => 1,
				'qty'           => $data['count'],
				'manage_stock'  => 0,
			)
		);
	}
    
	$fileName = Mage::getBaseDir('media').'/import/'.basename($data['image']);

	if (is_file($filePath))
	{
		try 
		{
			$product->addImageToMediaGallery($fileName, array('thumbnail','small_image','image'), false, false);
		} 
		catch (Exception $e) 
		{
			echo $e->getMessage();
		}
	}

	$product->setAttributeSetId(4); 
	$product->setName($data['name']);
	$product->setCategoryIds($data['categoryIds']);
	$product->setKeywords($data['keywords']);
	$product->setDescription($data['description']);
	$product->setShortDescription($data['shortDescription']);
	$product->setPrice($data['price']);

	/** Yandex.Market **/
	$product->setYmlExport(1);
	$product->setBid(0);
	$product->setCBid(0);
	$product->setModel($data['name']);

	try
	{
		$product->save();
		echo "Success\n";
		return $product->getId();
	}
	catch (Exception $e)
	{
		echo "Exception: ".$e->getMessage()."\n";
	}

	return false;
}
?>

Remove all products from store with id 1

<?php
$products = Mage::getResourceModel('catalog/product_collection')->setStoreId(1)->getAllIds();

if(is_array($products))
{
    foreach ($products as $key => $productId)
    {
        try 
        {
            $product = Mage::getSingleton('catalog/product')->load($productId);
            Mage::dispatchEvent('catalog_controller_product_delete', array('product' => $product));
            $product->delete();          
        } 
        catch (Exception $e) 
        {
            echo "<br/>Can't delete product w/ id: $productId";
        }
    }
}
?>

Add a new user

<?php
$user = Mage::getModel("admin/user")
		->setUsername('username')
		->setFirstname('Firstname')
		->setLastname('Lastname')
		->setEmail('username@example.com')
		->setPassword('demopass123')
		->save();
$role = Mage::getModel("admin/role");
$role->setParent_id(1);
$role->setTree_level(1);
$role->setRole_type('U');
$role->setUser_id($user->getId());
$role->save();
?>

Change user’s password

UPDATE admin_user SET password=CONCAT(MD5('qX[password]'), ':qX') WHERE username='[username]';
/**
 * where:
 *	[password] - user password
 * 	[username] - user name
 **/

Add a new product to cart

<?php
	function addProductToCart($product_id, $count)
	{
		try
		{
			$session = Mage::getSingleton('core/session', array('name'=>'frontend'));
			$cart = Mage::helper('checkout/cart')->getCart();
			
			$product = Mage::getModel('catalog/product')->load($product_id);
			$cart->addProduct($product, $count);

			$session->setLastAddedProductId($product->getId());
			$session->setCartWasUpdated(true);

			$cart->save();

			return true;
		}
		catch (Exception $e)
		{
			Mage::log("[addProductToCart] ".$e->getMessage());
		}

		return false;
	}
?>

Remove product from cart

<?php
	function removeProductFromCart($product_id)
	{
		try
		{
			$session = Mage::getSingleton('core/session', array('name'=>'frontend'));
			$cart = Mage::helper('checkout/cart')->getCart();
			$cart->getProductIds();
			$items = $cart->getItems();

			foreach ($items as $item)
			{
				if ($item->getProduct()->getId() == $product_id)
				{
					$cart->removeItem($item->getId());
					break;
				}
			}

			$session->setCartWasUpdated(true);

			$cart->save();

			return true;
		}
		catch (Exception $e)
		{
			Mage::log("[removeProductToCart] ".$e->getMessage());
		}

		return false;
	}
?>

Is product in cart?

<?php
	function isProductInCart($product_id)
	{
		try
		{
			$productIds = Mage::helper('checkout/cart')->getCart()->getProductIds();

			if (in_array($product_id, $productIds))
			{
				return true;
			}
		}
		catch (Exception $e)
		{
			Mage::log("[isProductInCart] ".$e->getMessage());
		}

		return false;
	}
?>

Get header cart html and products count

$result["cart_html"] = $app->getLayout()->getBlockSingleton('checkout/cart_sidebar')->setTemplate("checkout/cart/header.cart.phtml")->toHtml();
$result["cart_count"] = Mage::helper('checkout/cart')->getSummaryCount();

Get product quantity

(int) Mage::getModel('cataloginventory/stock_item')->loadByProduct($_product)->getQty();

Clear all orders

-- here are the tables modified for 1.5.0.1
 
SET FOREIGN_KEY_CHECKS=0;
 
TRUNCATE `sales_flat_order`;
TRUNCATE `sales_flat_order_address`;
TRUNCATE `sales_flat_order_grid`;
TRUNCATE `sales_flat_order_item`;
TRUNCATE `sales_flat_order_status_history`;
TRUNCATE `sales_flat_quote`;
TRUNCATE `sales_flat_quote_address`;
TRUNCATE `sales_flat_quote_address_item`;
TRUNCATE `sales_flat_quote_item`;
TRUNCATE `sales_flat_quote_item_option`;
TRUNCATE `sales_flat_order_payment`;
TRUNCATE `sales_flat_quote_payment`;
TRUNCATE `sales_flat_shipment`;
TRUNCATE `sales_flat_shipment_item`;
TRUNCATE `sales_flat_shipment_grid`;
TRUNCATE `sales_flat_invoice`;
TRUNCATE `sales_flat_invoice_grid`;
TRUNCATE `sales_flat_invoice_item`;
TRUNCATE `sendfriend_log`;
TRUNCATE `tag`;
TRUNCATE `tag_relation`;
TRUNCATE `tag_summary`;
TRUNCATE `wishlist`;
TRUNCATE `log_quote`;
TRUNCATE `report_event`;
 
ALTER TABLE `sales_flat_order` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_order_address` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_order_grid` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_order_item` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_order_status_history` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_quote` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_quote_address` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_quote_address_item` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_quote_item` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_quote_item_option` AUTO_INCREMENT=1;
ALTER TABLE `sendfriend_log` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_order_payment` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_quote_payment` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_shipment` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_shipment_item` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_invoice` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_invoice_grid` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_invoice_item` AUTO_INCREMENT=1;
ALTER TABLE `sales_flat_shipment_grid` AUTO_INCREMENT=1;
ALTER TABLE `tag` AUTO_INCREMENT=1;
ALTER TABLE `tag_relation` AUTO_INCREMENT=1;
ALTER TABLE `tag_summary` AUTO_INCREMENT=1;
ALTER TABLE `wishlist` AUTO_INCREMENT=1;
ALTER TABLE `log_quote` AUTO_INCREMENT=1;
ALTER TABLE `report_event` AUTO_INCREMENT=1;
 
-- lets reset customers
TRUNCATE `customer_address_entity`;
TRUNCATE `customer_address_entity_datetime`;
TRUNCATE `customer_address_entity_decimal`;
TRUNCATE `customer_address_entity_int`;
TRUNCATE `customer_address_entity_text`;
TRUNCATE `customer_address_entity_varchar`;
TRUNCATE `customer_entity`;
TRUNCATE `customer_entity_datetime`;
TRUNCATE `customer_entity_decimal`;
TRUNCATE `customer_entity_int`;
TRUNCATE `customer_entity_text`;
TRUNCATE `customer_entity_varchar`;
TRUNCATE `log_customer`;
TRUNCATE `log_visitor`;
TRUNCATE `log_visitor_info`;
 
ALTER TABLE `customer_address_entity` AUTO_INCREMENT=1;
ALTER TABLE `customer_address_entity_datetime` AUTO_INCREMENT=1;
ALTER TABLE `customer_address_entity_decimal` AUTO_INCREMENT=1;
ALTER TABLE `customer_address_entity_int` AUTO_INCREMENT=1;
ALTER TABLE `customer_address_entity_text` AUTO_INCREMENT=1;
ALTER TABLE `customer_address_entity_varchar` AUTO_INCREMENT=1;
ALTER TABLE `customer_entity` AUTO_INCREMENT=1;
ALTER TABLE `customer_entity_datetime` AUTO_INCREMENT=1;
ALTER TABLE `customer_entity_decimal` AUTO_INCREMENT=1;
ALTER TABLE `customer_entity_int` AUTO_INCREMENT=1;
ALTER TABLE `customer_entity_text` AUTO_INCREMENT=1;
ALTER TABLE `customer_entity_varchar` AUTO_INCREMENT=1;
ALTER TABLE `log_customer` AUTO_INCREMENT=1;
ALTER TABLE `log_visitor` AUTO_INCREMENT=1;
ALTER TABLE `log_visitor_info` AUTO_INCREMENT=1;
 
-- Now, lets Reset all ID counters
TRUNCATE `eav_entity_store`;
ALTER TABLE `eav_entity_store` AUTO_INCREMENT=1;
 
SET FOREIGN_KEY_CHECKS=1;

##Product navigation (getting previous and next items)

<?php
	/**
	 * Determine the previous/next link and link to current category
	 */
	$_ccat        = $this->helper('catalog/data')->getCategory();
	$ppos         = $_ccat->getProductsPosition();
	$current_pid  = $this->helper('catalog/data')->getProduct()->getId();
	// build array from products positions
	$plist = array();
	foreach ($ppos as $pid => $pos) {
		$plist[] = $pid;
	}
	$curpos   = array_search($current_pid, $plist);
	// get link for prev product
	$previd   = isset($plist[$curpos+1])? $plist[$curpos+1] : $current_pid;
	$product  = Mage::getModel('catalog/product')->load($previd);
	$prevpos  = $curpos;
	while (!$product->isVisibleInCatalog()) {
		$prevpos += 1;
		$nextid   = isset($plist[$prevpos])? $plist[$prevpos] : $current_pid;
		$product  = Mage::getModel('catalog/product')->load($nextid);
	}
	$prev_url = $product->getProductUrl();
	// get link for next product
	$nextid   = isset($plist[$curpos-1])? $plist[$curpos-1] : $current_pid;
	$product  = Mage::getModel('catalog/product')->load($nextid);
	$nextpos  = $curpos;
	while (!$product->isVisibleInCatalog()) {
		$nextpos -= 1;
		$nextid   = isset($plist[$nextpos])? $plist[$nextpos] : $current_pid;
		$product  = Mage::getModel('catalog/product')->load($nextid);
	}
	$next_url = $product->getProductUrl();
	// get link for current category
	$more_url = $_ccat->getUrl(); 
?>

##Add custom columns to the Magento administration Catalog > Product grid

<?php
class Zyn_Common_Block_Adminhtml_Catalog_Product_Grid extends Mage_Adminhtml_Block_Catalog_Product_Grid {

    protected function _prepareColumns() {	
        
	$this->addColumn('zyn_featured',
        array(
            'header'=> 'Show on Homepage',
            'width' => '50px',
			'index' => 'zyn_featured',
			'type'  => 'options',
			'options' => array(0 => 'No', 1 => 'Yes')
    	));

        parent::_prepareColumns();

    }

    protected function _prepareCollection() {
	$store = $this->_getStore();
        $collection = Mage::getModel('catalog/product')->getCollection()
            ->addAttributeToSelect('sku')
            ->addAttributeToSelect('name')
            ->addAttributeToSelect('attribute_set_id')
            ->addAttributeToSelect('type_id')
            ->addAttributeToSelect('zyn_featured');

        if (Mage::helper('catalog')->isModuleEnabled('Mage_CatalogInventory')) {
            $collection->joinField('qty',
                'cataloginventory/stock_item',
                'qty',
                'product_id=entity_id',
                '{{table}}.stock_id=1',
                'left');
        }
        if ($store->getId()) {
            $adminStore = Mage_Core_Model_App::ADMIN_STORE_ID;
            $collection->addStoreFilter($store);
            $collection->joinAttribute(
                'name',
                'catalog_product/name',
                'entity_id',
                null,
                'inner',
                $adminStore
            );
            $collection->joinAttribute(
                'custom_name',
                'catalog_product/name',
                'entity_id',
                null,
                'inner',
                $store->getId()
            );
            $collection->joinAttribute(
                'status',
                'catalog_product/status',
                'entity_id',
                null,
                'inner',
                $store->getId()
            );
            $collection->joinAttribute(
                'visibility',
                'catalog_product/visibility',
                'entity_id',
                null,
                'inner',
                $store->getId()
            );
            $collection->joinAttribute(
                'price',
                'catalog_product/price',
                'entity_id',
                null,
                'left',
                $store->getId()
            );
        }
        else {
            $collection->addAttributeToSelect('price');
            $collection->joinAttribute('status', 'catalog_product/status', 'entity_id', null, 'inner');
            $collection->joinAttribute('visibility', 'catalog_product/visibility', 'entity_id', null, 'inner');
        }

        $this->setCollection($collection);

        //parent::_prepareCollection();
        $this->getCollection()->addWebsiteNamesToResult();
        return $this;
    }
}
?>

Original article