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File: /var/www/delta/wp-content/plugins/sitepress-multilingual-cms/classes/comments/wpml-wp-comments.php
<?php

class WPML_WP_Comments {

	const LANG_CODE_FIELD = 'wpml_language_code';

	/**
	 * @var SitePress
	 */
	private $sitepress;

	/**
	 * WPML_WP_Comments constructor.
	 *
	 * @param SitePress $sitepress
	 */
	public function __construct( SitePress $sitepress ) {
		$this->sitepress = $sitepress;
	}

	public function add_hooks() {
		add_filter( 'comment_form_field_comment', array( $this, 'add_wpml_language_field' ) );
	}

	/**
	 * @return mixed
	 */
	public function add_wpml_language_field( $comment_field ) {
		$comment_field .= '<input name="' . self::LANG_CODE_FIELD . '" type="hidden" value="' . $this->sitepress->get_current_language() . '" />';

		return $comment_field;
	}
}