WordPress Environment Configuration

env.php

<?php
/**
 * Plugin Name: Environment Configuration
 * Description: Enforces environment-specific settings for the current environment.
 */

namespace App\Environment;

function disable_plugins( $disable_plugins ) {
	add_filter(
		'option_active_plugins',
		function ( $active_plugins ) use ( $disable_plugins ) {
			return array_diff( $active_plugins, (array) $disable_plugins );
		}
	);
}

function use_mailtrap( \PHPMailer $phpmailer ) {
	$phpmailer->isSMTP();
	$phpmailer->Host     = 'smtp.mailtrap.io';
	$phpmailer->SMTPAuth = true;
	$phpmailer->Port     = 2525;
	$phpmailer->Username = getenv( 'MAILTRAP_USER' );
	$phpmailer->Password = getenv( 'MAILTRAP_PASS' );
}

call_user_func(
	function ( $env ) {
		if ( 'production' !== $env ) {
			// Disable transactional email plugin.
			disable_plugins( 'mailgun/mailgun.php' );
			// Send emails to Mailtrap.
			add_action( 'phpmailer_init', __NAMESPACE__ . '\\use_mailtrap' );
		}
	},
	defined( 'WP_ENV' ) ? WP_ENV : 'development'
);