Override a route controller in Drupal 8
We know it is not a good practice changing core files or any contributed files directly. But situation will come to change some core files or some other contributed module files based on requirements. One best example is changing controllers for routes.
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Create a custom block in drupal 8
Drupal 8 allows creating custom block with the help of oops concepts. Each block in drupal 8 should be defined in a separate plugin file. Before starting developing a custom block you should have a basic knowledge about a custom module.
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Create a simple custom module in Drupal 8
The modules in drupal 8 placed inside /modules directory. Both contributed and custom modules can be added inside this directory.
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