magentoモジュール書き換え

書き換えapp/code/core/Mage/Catalog/Block/Navigation.phpを例に
 
1.マッチのコピー(推奨しない)
 
First add a new Navigation.php file you can edit to your local folder that Magento will reference instead of the original.
 
Copy the original found here:  app/code/core/Mage/Catalog/Block/Navigation.php
Recreate this folder structure in your app/code/local folder. So go to app/code/local, make a Mage folder, inside it make a Catalog folder, inside that make a Block folder, and inside that place your copy of Navigation.php, eg:  app/code/local/Mage/Catalog/Block/Navigation.php
 
Second, add some code to the app/etc/local.xml file, inside of the global tags.

<blocks> 
    <catalog>
        <rewrite>
            <navigation>Mage_Catalog_Block_Navigation</navigation>                
        </rewrite>
    </catalog>
</blocks> 

 
2.書き換え(推奨)
 
If you want to override a core controller on Magento in order to add other customActions, it is really quick and easy to do so. Here are the files that you have to take into account:

The block you want to override :/app/code/core/Mage/Catalog/Block/Navigation.php

The xml file to enable the module:/app/etc/modules/[namespace] _All.xml

The block xml file definition :/app/code/local/[namespace]/Catalog/etc/config.xml

The overridden block :/app/code/local/[namespace]/Catalog/Block/Navigation.php

本明細書のすべての[namespace]は、自分のインスタンスの名前「App」に置き換えられます.他のネーミングスペースを使用する場合は、[namespace]を置き換えることができます.
 
First of all, you have to enable the module on the/app/etc/modules/directory. This file would be App _All.xml and inside that:  

<?xml version="1.0"?>
<config>
     <modules>
        <App_Catalog>
            <active>true</active>
            <codePool>local</codePool>
            <!--depends>
                <Mage_Core/>
            </depends-->
        </App_Catalog>
     </modules>
</config>

 
dependsを開くとcore classに頼ることを表し、
 
Now it’s time to create the/app/code/local/App/Catalog/etc/config.xml file that will override the core block:

<?xml version="1.0" encoding="UTF-8"?>
<config>
    <modules>
        <App_Catalog>
            <version>0.1.0</version>
        </App_Catalog>
    </modules>
    <global>
        <blocks>
            <catalog>
                <rewrite>
                        <navigation>App_Catalog_Block_Navigation</navigation>
                </rewrite>
            </catalog>
        </blocks>
    </global>
</config>

 
注意:App_Catalog_Block_NavigationでApp_Catalog_Block_Navigationは勝手に名前をつけることはできません.必ず正しい完全な経路を形成しなければなりません.[namespace]Catalog_Block_Navigation => [namespace]/Catalog/Block/Navigation.php
 
Finally, we can create the class that will add/change actions to the core block: app/code/local/App/Catalog/Block/Navigation.php

<?php
class App_Catalog_Block_Navigation extends Mage_Catalog_Block_Navigation
{
    protected function _renderCategoryMenuItemHtml($category, $level = 0, $isLast = false, $isFirst = false,
        $isOutermost = false, $outermostItemClass = '', $childrenWrapClass = '', $noEventAttributes = false, $showText = false)
    {
       /* .... */
    }
}

 
注意:classは元のMageを継承しています.Catalog_Block_Navigation
 
注意:効果を見る場合は、cacheをクリーンアップするか、バックグラウンドでdisable cacheをクリアします.