Helper Block Definition
<config>
<global>
<helpers>
<namespace_module>
<class>Namespace_Module_Helper</class>
</namespace_module>
</helpers>
</global>
</config>
Related cards:
Config Block Definition
<config>
<global>
<blocks>
<namespace_module>
<class>Namespace_Module_Block</class>
</namespace_module>
</blocks>
</global>
</config>
![](http://m...
Config Block rewrite Definition
<config>
<global>
<blocks>
<catalog>
<rewrite>
<product>Namespace_Module_Block_Catalog_Product</product>
</rewrite>
</catalog>
...
Config Helper Rewrite Definition
<config>
<global>
<helpers>
<catalog>
<rewrite>
<data>Namespace_Module_Helper_Catalog_Data</data>
</rewrite>
</catalog>
...
Messages and Global Messages Blocks
Both use the same block, as we can see in page.xml:
<block type="core/messages" name="global_messages" as="global_messages"/>
<block type="core/messages" name="messages" as="messages"/>
When you add a message, you add it to the session...
Children of Anonymous Blocks are Orphaned
What a sad state of affairs. If a childs parent has no name, the child block becomes orphaned and alone, somewhere lost in Layout XML hell. To sort it, give the parent a name. The reason? The layout XML parser uses the name of the parent in XML to...
Boilerplate Block Class
With template support:
/**
* Yourcompany.com
*
* PHP Version 5
*
* @category Namespace
* @package Namespace_Module
* @author Your Name <your.name@yourcompany.com>
* @copyright 2012 yourcompany.com...
Block Caching
To cache a block individually, add this method to the blocks class:
protected function _construct()
{
$this->addData(array(
'cache_lifetime' => 3600,
'cache_tags' => array(Mage_Cms_Model_Block::CACHE_TA...
Boilerplate Helper Class
/**
* Yourcompany.com
*
* PHP Version 5
*
* @category Namespace
* @package Namespace_Module
* @author Your Name <your.name@yourcompany.com>
* @copyright 2012 yourcompany.com
* @license http:...
Config ACL Definition
This should go in adminhtml.xml. Also see Config Menu Definition (note that the XML path of the menu entry needs to match up with the XML path of the ACL entry). To see how to impl...
Config Menu Definition
This should go in adminhtml.xml. Also see Config ACL Definition (note that the XML path of the ACL entry needs to match up with the XML path of the menu entry).
To place an entry und...