Disable Gutenberg editor in WordPress 5.x

disable-gutenberg-wordpress-5

/**
*
* Disable Gutenberg Editor for all post types
*
*/

// disable for posts
add_filter('use_block_editor_for_post', '__return_false', 10);

// disable for post types
add_filter('use_block_editor_for_post_type', '__return_false', 10);