Mini-plugin to enable WP_DEBUG, WP_DEBUG_DISPLAY, & WP_DEBUG_LOG on a site where not FTP/SFTP access is available.

enable-debug.php

<?php
/**
 * Plugin Name: Enable WP_DEBUG
 * Plugin URI: https://gist.github.com/thenbrent/d319cd9eaa88faea5cb69d296ea8ccc1
 * Description: Enable WP_DEBUG, WP_DEBUG_DISPLAY, & WP_DEBUG_LOG on a site where not FTP/SFTP access is available.
 * Author: Prospress Inc.
 * Version: 1.0
 * Author URI: http://prospress.com
 *
 * Copyright 2017 Prospress, Inc.  (email : [email protected])
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @author		Prospress Inc.
 * @since		1.0
 */

if ( ! defined( 'WP_DEBUG' ) ) {
  define( 'WP_DEBUG', true );
}

if ( ! defined( 'WP_DEBUG_DISPLAY' ) ) {
  define( 'WP_DEBUG_DISPLAY', true );
}

if ( ! defined( 'WP_DEBUG_LOG' ) ) {
  define( 'WP_DEBUG_LOG', true );
}