How to disable Gutenberg editor through functions.php

WordPress 5.0 is being rolled out which will replace the classic editor with a block type editor titled ‘Gutenberg’. For those that wish to remain with the classic editor but do not want to install any additional plugins, you can follow these quick steps:

1. Create a child theme of your template and make sure it has a functions.php file
2. Add the following code to your functions.php (in the child theme)
• add_filter('use_block_editor_for_post', '__return_false');
3. Save the file and your classic editor will be restored