Send emails to everybody else on a ticket

functions-everybody-else-notification.php

<?php
/**
 * @package   Awesome Support: Everybody Reply
 * @author    Nathan Moinvaziri <nathan@nathanm.com>
 * @license   MIT
 * @link      http://github.com/nmoinvaz/
 * @copyright 2018 Nathan Moinvaziri
 *
 * @wordpress-plugin
 * Plugin Name:       Awesome Support: Everybody Reply
 * Plugin URI:        http://github.com/nmoinvaz/
 * Description:       This add-on for Awesome Support enables everybody to get reply email notifications on a ticket.
 * Version:           1.2.0
 * Author:            Nathan Moinvaziri
 * Author URI:        http://github.com/nmoinvaz/
 * Text Domain:       as-eb-reply
 * License:           MIT
 * Domain Path:       /languages
 */

// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}

add_filter( 'wpas_email_notifications_email', 'aseall_set_notification_email', 12, 4 );

/**
 * Set the recipient for the e-mail notification
 *
 * @since 0.2.5
 *
 * @param null|WP_User $email     A email object
 * @param string       $case      Case of the notification being sent out
 * @param int          $ticket_id ID of the ticket being processed
 * @param int          $post_id   ID of the post being processed
 *
 * @return WP_User
 */
function aseall_set_notification_email( $email, $case, $ticket_id, $post_id ) {

	if( 'private_note_created' === $case || 'satisfaction_survey' === $case ) {
		return $email;
	}
	if ( $ticket_id == null || $post_id == null ) {
		return $email;
	}
	
	$users = wpas_get_users_who_replied($ticket_id);
	
	if (count($users) == 0) {
		return $email;
	}
	
	$recipients = array();
	
	// Copy original array of recipients
	foreach ($email['recipient_email'] as $recipient) {
		$recipients[] = $recipient['user_id'];
	}

	// Add new users to array of recipients if they don't already exist
	foreach ($users as $user_id) {
		if (!in_array($user_id, $recipients)) {
			$recipients[] = $user_id;
		}
	}
		
	// Only send emails to users who can edit ticket since note is private
	if ( 'ticket_note' === $case ) {
		foreach ($recipients as $user_id) {
			// Apparently safe in php lol
			if (!user_can( $user_id, 'edit_ticket' )) {
				if (($key = array_search($user_id, $recipients)) !== false) {
					unset($recipients[$key]);
				}
			}
		}
	}
	
	// Rebuild array of recipients
	$email['recipient_email'] = array();
	foreach ($recipients as $user_id) {
		$user = get_user_by( 'id', $user_id );
		$email['recipient_email'][] = array( 'user_id' => $user->ID, 'email' => $user->user_email );
	}
	
	return $email;

}

/**
 * Get all users who replied on a ticket
 *
 * @param integer      $post_id ID of the post (ticket) to get the agents from
 * @param array        $args    Additional arguments (see WP_Query)

 * @return array|ids
 */
function wpas_get_users_who_replied( $post_id, $args = array() ) {
	
	$users = array();
	
	$ticket = get_post($post_id);
	if ($ticket == null) {
		return $users;
	}
	
	$defaults = array(
		'post_parent'            => $post_id,
		'post_type'              => array('ticket_reply', 'ticket_note'),
		'post_status'            => 'any',
		'order'                  => wpas_get_option( 'replies_order', 'ASC' ),
		'orderby'                => 'date',
		'posts_per_page'         => - 1,
		'no_found_rows'          => true,
		'cache_results'          => false,
		'update_post_term_cache' => false,
		'update_post_meta_cache' => false,
    	);
	
	$args = wp_parse_args( $args, $defaults );
	$query = new WP_Query( $args );
	
	if (!is_wp_error( $query )) {
		foreach ($query->posts as $reply) {
			if (!in_array($reply->post_author, $users) && $reply->post_author != $ticket->post_author) {
				$users[] = $reply->post_author;
			}
		}
	}
		
	return $users;
}