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<?php
/*
Plugin Name: [Membership] add editors in auto emails
Plugin URI: https://premium.wpmudev.org/
Description: Adds editors emails in the "Send copy to Administrator"
Author: Panos Lyrakis @ WPMUDEV
Author URI: https://premium.wpmudev.org/
License: GPLv2 or later
*/

add_filter( 'ms_view_settings_prepare_email_fields', function( $fields ){

	$admin_emails = $fields['cc_email']['field_options'];
	$editor_emails = array();

		$args = array(
			'role' => 'editor',
			'fields' => array( 'ID', 'user_email' ),
		);

		$wp_user_search = new WP_User_Query( $args );
		$users = $wp_user_search->get_results();

		if ( ! empty ($users ) ) {
			foreach ( $users as $user ) {
				$editor_emails[ $user->user_email ] = $user->user_email;
			}
		}

		$fields['cc_email']['field_options'] = array_merge( $admin_emails, $editor_emails );

		return $fields;

}, 10 );