Disable Gutenberg in WordPress 5.0

wearewp-disable-gutenberg.php

<?php
/*
  Plugin Name:  WeAreWP Gutenberg
  Description:  Disable Gutenberg in WordPress 5.0
  Plugin URI:   https://www.wearewp.pro
  Version:      1.0
  Author:       WeAre[WP]
  Author URI:   https://www.wearewp.pro
*/

if ( ! defined( 'ABSPATH' ) ) {
	die( 'Cannot access pages directly.' );
}



/**
*
*  Disbale Gutenberg only for All Custom Post Type
*
**/
//	Newer versions of Gutenberg (4.1+), and WordPress 5.0 beta
add_filter('use_block_editor_for_post', '__return_false');

//	Older versions of Gutenberg (less than 4.1), and WordPress versions less than 5.0 beta
add_filter('gutenberg_can_edit_post_type', '__return_false');


/** ---------------------------------------------------------------------------------- **/


/**
*
*  Disbale Gutenberg only for Custom Post Type Testinonial
*
**/
//	Newer versions of Gutenberg (4.1+), and WordPress 5.0 beta
add_filter('use_block_editor_for_post_type', 'wearewp_disable_gutenberg', 10, 2);

//	Older versions of Gutenberg (less than 4.1), and WordPress versions less than 5.0 beta
add_filter('gutenberg_can_edit_post_type', 'wearewp_disable_gutenberg', 10, 2);

function wearewp_disable_gutenberg( $is_enabled, $post_type ) {
	
	//	Change testimonial to your post type
	if ($post_type === 'testimonial'){
		return false;
	}
	
	return $is_enabled;
	
}