Create 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:

<?xml version="1.0"?>
<config>
    <modules>
		<Mycode_Function>
			<active>true</active>
			<codePool>local</codePool>
		</Mycode_Function>
    </modules>
</config>

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

<?xml version="1.0"?>
<config>
 
    <modules>
        <Mycode_Function>
            <version>1.0.0</version>
        </Mycode_Function>
    </modules>
 
    <global>
 
        <helpers>
            <function>
                <class>Mycode_Function_Helper</class>
            </function>
        </helpers> 
 
    </global>
 
</config>

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

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

You can now call this function like so

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