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You can create an invoice programmatically for an order by using the below code

Some time we need to change the Order status programmatically , the below code will allow us to do this

Hi, This extension will allow you to ad google reCaptcha to any form you want by add one line , only one line will activate the reCaptcha

First step is to set the configuration from 

System -> Configuration 

Go to the ZEO Extension section then click on reCaptcha

Then add the configuration

change your directory to Magento root then execute this command

php -r 'require "app/Mage.php"; Mage::app()->getCacheInstance()->flush();'

First of all you need to change the directory to  shell folder under magento root

{Magento root}/shell

Checking for the status of all indexes

php indexer.php --status

Re-indexing a single index
Each index has its own index key that you can use to reference it when asking Magento to re-index. To get these keys, you can use the following command:

php indexer.php --info

How to Send rest password link email to customer programmatically in magento?

Usually you need to load the customer first, then call the function on customer logic like this 

if you want to add product to cart programmatically only if the product is not exist you have to use this code,

in this code you will check if the product is not exist in the Cart Quote, then if it is not exist you will add it