This Extension adds a PSR-0 Autoloader before the Magento Autoloader
To initialize a new namespace, insert following code in the <global/>
-node of local.xml:
<psr0_namespaces>
<NewNamespace />
</psr0_namespaces>
You can also use this Extension to add the composer Autoloader.
You need to configure the Path to your Vendor directory in your <global/>
-node of local.xml:
<composer_vendor_path><![CDATA[{{root_dir}}/vendor]]></composer_vendor_path>