Magento 2 Development Quick Start Guide

The after plugin

The after plugin, as its name suggests, runs after the observed method.

When writing the after plugin, there are a few key points to remember:

1. The first parameter coming into the plugin is an observed type instance.
2. The second parameter coming into the plugin is the result of the observed method, often called $result or called after the variable returned from the observed method (as in the following example: $data).
3. All other parameters are parameters of the observed method.
4. The plugin must return the same $result|$data variable of the same type, as we are free to modify the value.

Let's take a look at one of Magento's after plugin implementations, the one specified in the module-catalog/etc/di.xml file:

<type name="Magento\Indexer\Model\Config\Data"> ...