multilingual-comments-wpml.php

<?php
/**
 * Plugin Name: Multilingual Comments WPML
 * Plugin URI: https://wordpress.org/plugins/multilingual-comments-wpml
 * Description: This plugin combines comments from all translations of the posts and pages using WPML. Comments are internally still attached to the post or page in the language they were made on.
 *
 * Version: 1.2.1
 * Author: Pieter Bos
 * Author URI: https://so-wp.com
 *
 * Requires at least:	4.9
 * Tested up to:		6.5

 * License: GPL-3.0+
 * License URI: http://www.gnu.org/licenses/gpl-3.0.txt
 *
 * Text Domain: multilingual-comments-wpml
 *
 * GitHub Plugin URI:	https://github.com/senlin/multilingual-comments-wpml
 * GitHub Branch:		main

 * @package WordPress
 * @author Pieter Bos
 * @since 1.0.0
 */


/**
 * This is a fixed version of the no longer maintained WPML Comment Merging plugin:
 * http://wordpress.org/extend/plugins/wpml-comment-merging/ and https://github.com/JulioPotier/wpml-comments-merging
 */

// don't load the plugin file directly
if (!defined('ABSPATH')) exit;

class Multilingual_Comments_WPML
{
	public function __construct()
	{
		register_activation_hook(__FILE__, [$this, 'activate']);
		add_filter('comments_array', [$this, 'merge_comments'], 100, 2);
		add_filter('get_comments_number', [$this, 'merge_comment_count'], 100, 2);
	}

	public function is_wpml_active()
	{
		if (!function_exists('is_plugin_active')) {
			include_once(ABSPATH . 'wp-admin/includes/plugin.php');
		}

		return is_plugin_active('sitepress-multilingual-cms/sitepress.php');
	}

	public function activate()
	{
		if (!$this->is_wpml_active()) {
			deactivate_plugins(plugin_basename(__FILE__));
			wp_die(
				__(
					'The "Multilingual Comments (WPML)" plugin requires the WPML plugin to be installed and activated.',
					'multilingual-comments-wpml'
				),
				__('Plugin Activation Error', 'multilingual-comments-wpml'),
				array('response' => 200, 'back_link' => true)
			);
		}
	}

	private function sort_merged_comments($a, $b)
	{
		return $a->comment_ID - $b->comment_ID;
	}

	public function merge_comments($comments, $post_ID)
	{
		global $sitepress;

		remove_filter('comments_clauses', array($sitepress, 'comments_clauses'));

		$languages = apply_filters('wpml_active_languages', null, 'skip_missing=1');

		$post = get_post($post_ID);
		$type = $post->post_type;

		foreach ($languages as $code => $l) {
			if (!$l['active']) {
				$otherID = apply_filters('wpml_object_id', $post_ID, $type, false, $l['language_code']);
				// add condition to prevent $otherID returning `null`
				if ($otherID) {
					$othercomments = get_comments(array('post_id' => $otherID, 'status' => 'approve', 'order' => 'ASC'));
					$comments = array_merge($comments, $othercomments);
				}
			}
		}

		if ($languages) {
			usort($comments, [$this, 'sort_merged_comments']);
		}

		add_filter('comments_clauses', array($sitepress, 'comments_clauses'), 10, 2);

		return $comments;
	}

	public function merge_comment_count($count, $post_ID)
	{
		$languages = apply_filters('wpml_active_languages', null, 'skip_missing=1');

		$post = get_post($post_ID);
		$type = $post->post_type;

		foreach ($languages as $l) {
			if (!$l['active']) {
				$otherID = apply_filters('wpml_object_id', $post_ID, $type, false, $l['language_code']);
				if ($otherID) {
					$otherpost = get_post($otherID);
					if ($otherpost) {
						$count = $count + $otherpost->comment_count;
					}
				}
			}
		}

		return $count;
	}
}

$multilingual_comments_wpml = new Multilingual_Comments_WPML();