Create a Global function in Magento

This code will allow you to add a function that can be called from anywhere within Magento. It extends the helper class

1) Create a file named ‘Mycode.xml’ and copy it to app/etc/modules/ – it should look like this:

 version="1.0"?>             true    local         

2) Create the directory
app/code/local/Mycode/Function/etc
and then create a file named ‘config.xml’
In it copy:

 version="1.0"?>                              1.0.0                                                              Mycode_Function_Helper                                 

3) Create the directory
app/code/local/Mycode/Function/Helper
and then create a file named ‘Data.php’
In it copy:

   class Mycode_Function_Helper_Data extends Mage_Core_Helper_Abstract {    public function test(){    return 'works';    }   }

You can now call this function like so

         echo Mage::helper('function')->test();      ?>