2

1) Use preference in di.xml and add new methods or do changes

2) Or create a new class which extends the actual class and attach the new class to your phtml.

Lets suppose you want to extend Magento\Catalog\Block\Product\Listproduct then you create a class like Vendor\Module\Block\Product\Listproduct and change here

<block class="Vendor\Module\Block\Product\Listproduct" name="category.products.list" as="product_list" template="Magento_Catalog::product/list.phtml">
  • i will go with the second approach. Its much more flexible. Plugins wont work here as i needed a new method. – Kingshuk Deb Feb 12 at 10:39
0

Rather than extend block use Plugin

There is three type of plugin

  • Before plugin

  • After plugin

  • Around plugin

For more info please refer link

0

The best way to override a block would be a plugin, but note that a plugin can not be used on following:

  1. Final methods
  2. List item
  3. Non-public methods
  4. Class methods (such as static methods)
  5. __construct
  6. Virtual types
  7. Objects that are instantiated before Magento\Framework\Interception is bootstrapped.

Reference - https://devdocs.magento.com/guides/v2.3/extension-dev-guide/plugins.html

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