magento 2 di.xml etc/ etc/area_code/ 區別

在開發過程中，寫了di.xml,放入 etc/frontent/ 是工作的， 但是放入 etc/下 是不工作的

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Framework\App\RouterList" shared="true">
        <arguments>
            <argument name="routerList" xsi:type="array">
                <item name="customrouter" xsi:type="array">
                    <item name="class" xsi:type="string">Training\Unit14\Controller\CustomRouter</item>
                    <item name="disable" xsi:type="boolean">false</item>
                    <item name="sortOrder" xsi:type="string">40</item>
                </item>
            </argument>
        </arguments>
    </type>
</config>

通過GOOGLE找到下面文檔 

https://magento.stackexchange.com/questions/150516/magento-2-di-xml-merging-with-arguments

MAGENTO在merge xml的過程中

即 相同 area code 下面會merge, 但是會覆蓋GLOABL下面的

di.xml https://devdocs.magento.com/guides/v2.3/extension-dev-guide/build/di-xml-file.html

merge https://devdocs.magento.com/guides/v2.3/config-guide/config/config-files.html

Area-specific configuration from modules (<your component base dir>/<vendorname>/<component-type>-<component-name>/etc/<area>/*.xml). Collects configuration files from all modules and merges them into the global configuration. Some area-specific configurations can override or extend the global configuration.