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Layout XML in Themes<br />
In what order is layout XML merged within the same handle?<br />
This would then be according to the order in which the layout files are loaded. See<br />
the in-depth topic on section 3.6.<br />
How can the processing order be influenced?<br />
The processing order and merging of layout XML is determined by the module<br />
load order. Adjusting the setting for modules will influence the<br />
processing order of layout XML.<br />
For backend <strong>developer</strong>s, you can use plugins to inject your layout handles earlier in<br />
the process. For example, if you want to add a layout handle before the catalog_<br />
product_view one, you need to create a before plugin for \Magento\<br />
Catalog\Helper\Product\View::initProductLayout.<br />
What are common problems arising from the merge order of<br />
layout declarations?<br />
The most common problems are:<br />
• Accidental overrides: where you specify which<br />
happens to be the same name as another block.<br />
• Wishful overrides: where you want to override another block, but you specify<br />
a different name and the block is injected twice.<br />
Copyright © 2018, SwiftOtter, Inc.<br />
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