Magento helper call from template from outside module

Question

I am using Mage::helper('addmultiple') where addmultiple is my module name Mycompany_Addmultiple_Helper_Data in Data.php in my modules helper. it gives a fatal error and why it tries to locate Mage_Addmultiple_Helper_Data instead of Mycompany_Addmultiple_Helper_Data

xml entry in my global block

<helpers>
    <addmultiple>
        <class>Mycompany_Addmultiple_Helper</class>
    </addmultiple>
</helpers>

note that when i call this from my block file or controller file from same module it is working.

I am trying to call this from some overridden core template right now.

Answer 1

Try with this.

config.xml

<helpers>
    <addmultiple>
        <class>Mycompany_Addmultiple_Helper</class>
    </addmultiple>
</helpers>

Use a name for your helper class instead of default name 'Data.php'. Here I'm using Test.php as the helper class.

class Mycompany_Addmultiple_Helper_Test extends Mage_Core_Helper_Abstract
{
   // some code
   } 

Now you can call the Test.php helper class as below.

$my_helper = Mage::helper('addmultiple/test');