Plugins in Magento 2 are like special tools that can modify how things work without changing the original code. They act as an extra layer and intercept the behaviour of existing code, allowing you to customize and extend the functionality of your Magento 2 store modularly.
Using plugins in Magento 2 comes with several advantages. They help keep your code organized by separating your customizations from the core code. Using plugins in Magento 2 has two main benefits.
Firstly, when you need to upgrade your store, plugins make it easier to keep your modifications intact without losing them.
Secondly, plugins help avoid conflicts with other customizations, ensuring that your store's different parts work well together without any issues. In simple terms, plugins provide a smooth and hassle-free way to upgrade and customize your Magento 2 store.
Overall, plugins offer a flexible and reliable way to enhance your Magento 2 store's functionality while keeping the core code intact.
Here is a list of the Ability of Plugins in Magento 2.
– Before plugins, modify the input arguments to a method. You can change them to any value.
Example from: \Magento\Catalog\Block\Product\ListProduct
<?php
public function prepareSortableFieldsByCategory($category)
{
// receive the category as argument and process it..
return $this; // return the
}
?>
To modify the argument of the prepareSortableFieldsByCategory($category) method, add a method to the plugin class:
We need to define the method name with the prefix "before" for this.
The method above is run before "\Magento\Catalog\Block\Product\ ListProduct::prepareSortableFieldsByCategory".
The return value for the before plugin determines the arguments going into the following plugin or the final targeted method.
<?php
public function beforePrepareSortableFieldsByCategory( \Magento\Catalog\Block\Product\ListProduct $context, $category )
{
// ...made changes here with category passed by refrenes...
return [$category];
}
?>
– After plugins are used to modify the return value.
Example from: \Magento\Catalog\Block\Product\ListProduct
<?php
public function getProductPrice(Product $product)
{
// receive the product as argument and process it..
return $price; // return the
}
?>
If you need to modify the output from a public method, use an after-plugin.
Let's modify the getProductPrice($product) in our example class. As such, in our plugin class, we would create the following:
<?php
public function afterGetProductPrice( \Magento\Catalog\Block\Product\ListProduct $context, $result, \Magento\Catalog\Model\Product $product )
{
// ...made changes here with category passed by refrenes...
return $result;
}
?>
The after plugin includes the input parameters in addition to the return result.
– The around plugin modification of the input and output of a function. The original function is passed in as a callback and, by standard, is named "$proceed".
Example from: \Magento\Catalog\Block\Product\ListProduct
<?php
public function getProductPrice(Product $product)
{
// receive the product as argument and process it..
return $price; // return the
}
?>
Let's modify the getProductPrice($product) in our example class. As such, in our plugin class, we would create the following:
<?php
public function aroundGetProductPrice( \Magento\Catalog\Block\Product\ListProduct $context, callable $proceed)
{
echo __METHOD__ . " - Before original method call </br>";
$result = $proceed();
echo __METHOD__ . " - After original method call </br>";
return $result;
}
?>
We must define the method name with the prefix "around" for this.
We should return the "Original methods returned value" to execute the following plugin.
If the callable is not declared, neither the following plugin nor the original method can be called.
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