Override core block in magento

The simplest way to override a core block is to simply copy the file into the corresponding /app/code/local/ folder, and Magento automatically uses that version of the file without an XML/config changes needed.

So just copy /app/code/core/Mage/Checkout/Block/Cart/Item/Renderer.php into /app/code/local/Mage/Checkout/Block/Cart/Item/ and be sure to refresh the cache.

MVC pattern of Magento files & folder structure

/ app - is where the application resides

/ app / etc - is global configuration den

/ app / code - is where modules have installed their models and controllers

/ app / code / core - are core team developed or certified modules

/ app / code / community - are community contributed modules

/ app / code / local - are local customizations

/ app / code / core / Mage - magento default namespace

/ app / code / core / Mage / {Module} - module root

/ app / code / core / Mage / {Module} / etc - module configuration

/ app / code / core / Mage / {Module} / controllers - controllers provided by module

/ app / code / core / Mage / {Module} / Block - Block logic classes

/ app / code / core / Mage / {Module} / Model - Object Models provided by module

/ app / code / core / Mage / {Module} / Model / Mysql4 - Resource Models provided by module

/ app / code / core / Mage / {Module} / sql - sql installation and upgrade files between module versions

/ app / code / core / Mage / {Module} / sql / {resource} / - resource model specific upgrades

/ app / code / core / Mage / {Module} / sql / {resource} / {type}-{action}-{versions}.(sql|php) - resource update files. example: mysql4-upgrade-0.6.23-0.6.25.sql

/ app / design - is location of design packages (layouts, templates, translations)

/ app / design / frontend - frontend design

/ app / design / adminhtml - HTML admin panel design

/ app / design / {area} / {package} / {theme} - theme customizations

/ app / design / {area} / {package} / {theme} / layout - .xml files that define block structure for different cases in website flow

/ app / design / {area} / {package} / {theme} / template - .phtml (html with php tags) templates

/ app / design / {area} / {package} / {theme} / locale - Zend_Translate compatible translation files for package/theme

/ app / locale - locale files

/ app / locale / {locale (en_US)} - Zend_Translate compatible translation files for modules

/ skin / {area} / {package} / {theme} / - is where design package css and images are

/ lib - are libraries such as Zend and Varien

/ js - are javascripts smile

/ media - uploaded files (product images, pdf documents, etc)

/ tests - Unit tests (not done yet)

/ var - temporary files

/ includes - contains config.php

Getting Ordered Items and their Detail from Order ID in Magento

$order = Mage::getModel('sales/order')->load($order_id);
$items = $order->getAllItems();
$itemcount=count($items);
$name=array();
$unitPrice=array();
$sku=array();
$ids=array();
$qty=array();
foreach ($items as $itemId => $item)
{
$name[] = $item->getName();
$unitPrice[]=$item->getPrice();
$sku[]=$item->getSku();
$ids[]=$item->getProductId();
$qty[]=$item->getQtyToInvoice();
}

Extension for delete orders

By using this extension we can delete only cancel order, so we need to cancel the order before delete.

Link : http://www.magentocommerce.com/magento-connect/Boutik+Circus/extension/873/delete-orders

SMTP magento extension

Link : http://www.magentocommerce.com/extension/1865

Link :
http://www.aschroder.com/wp-content/uploads/2010/03/Aschroder_SMTPPro-1.0.1.zip

sql order query

SELECT * FROM sales_flat_order_item t inner join sales_order s on s.entity_id =t.order_id where customer_id='1';

Solution of value has to be numeric error in magento

Error : Value '65,000000' has to be numeric.

Solution :

It just appeared, when your locale number format was not similar to the English one.

Reason:
In app/code/core/Mage/Directory/Model/Currency.php(203) you will find the method 'formatTxt()'.
In there is a fix for a problem with formatted price-values coming in.
In line 211 you'll find the following code:

$price = sprintf("%f", $price);

This sprintf-function does not return the type of its content correctly (has to be double/numeric) if this content (a price-value) is formatted in non-english-style (e.g. '0,0000000 instead of 0.0000000).

In app/code/core/Mage/Directory/Model/Currency.php(212) the method Zend_Currency->toCurrency() is called with the output of the sprintf-function.
So, testing this incoming variable in the Zend-Method to be of numeric type causes the error described above.

Solution:
Replace the sprintf-function with the following code:

$price = (float) $price;

Disable modules in Magento [Disable module increases little bit speed of site]

Magento has a huge number of features and there are few businesses that will need to use all of them

If you want to disable some features completely for your site you can do this easily through the administration options.

System > Configuration > Advanced > Disable module output or You can easily enable the module.

Hi friends,

      The blog is for Magento users and developers, contains helpful links and hints for Magento developers.Hints are taken from other helpful sites and created and tested by me as per my practical experience and knowledge of Magento.

    In the OS world, Magento absolutely stands alone in functionality and configuration, but... it is also absolutely not for the inexperienced or impatient because Lack Of Proper Documentation.

   I am trying to document all the essential funcitonalities of magento in this blog. Hope this blog will help you.

Cheers  :)

Get category name and url from product

$product->getCategoryIds() gives array of category
ids which the product is associated to. We can loop through
this array and load each category to get the category name
and url.

getCategoryIds();
/**
* looping through the array of category ids
*/
foreach($categoryIds as $categoryId) {
$category =
Mage::getModel('catalog/category')->load($categoryId);
?>
Category: getCategoryUrl() ?>">getName() ?>