magento 设立全局变量或函数 (Session, Registry 和 Function)

1. Magento: Get and set variables in session

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To set a Magento session variable:

$myValue = 'Hello World';Mage::getSingleton('core/session')->setMyValue($myValue);

To Retrieve:

$myValue = '';$myValue=Mage::getSingleton('core/session')->getMyValue();

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To Unset:

Mage::getSingleton('core/session')->unsMyValue();

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或者

/* Core Session */ Mage::getSingleton('core/session')->setYourVariable('data');$Data = Mage::getSingleton('core/session')->getYourVariable(); /* Customer Session */ Mage::getSingleton('customer/session')->setYourVariable('data');$Data = Mage::getSingleton('customer/session')->getYourVariable(); /* Admin Session */ Mage::getSingleton('admin/session')->setYourVariable('data');$Data = Mage::getSingleton('admin/session')->getYourVariable();

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2. Magento’s Registry Pattern

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The three registry methods are

Mage::registerMage::unregister   Mage::registry    

The register method is how you set a global-like variable.

Mage::register('some_name', $var);

Then, later in the request execution, (from any method), you can fetch your variable back out

$my_var = Mage::registry('some_name');

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Finally, if you want to make you variable unavailable, you can use the unregister method to remove it from the registry.

Mage::unregister('some_name');

更多参考： http://alanstorm.com/magento_registry_singleton_tutorial

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3.? Create Global Function In Magento

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

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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();  ?>

来源： http://joe-riggs.com/blog/2011/06/create-global-function-in-magento/

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本站相关：

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1. 深入理解Magento－第九章－修改、扩展、重写Magento代码

2. magento 模块重写

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