December 2015
Intermediate to advanced
412 pages
8h 14m
English
Content preview from Magento 2 Developer's GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Using the after listener
The after listeners are used when we want to change the values returned by an original method or add some behavior after an original method is called.
Looking back at the afterGetAddToCartUrl listener method definition, you will see that it has only one $subject property assigned.
With the after method listener, the first and only property is always the $subject property, which contains the instance of the object type being observed and not the return value of the observed method.
This simple rule used for transformation is as follows:
getAddToCartUrl($product, $additional = []) afterGetAddToCartUrl($subject)
The after listener methods do not need to have a return value.
Like the before interceptor method, the $subject property ...
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