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Edit File: wpml-functions.php

<?php
/**
 * WPML compatibility functions
 *
 * @global array $duplicated_posts Array to store the posts being duplicated.
 *
 * @package Yoast\WP\Duplicate_Post
 * @since   3.2
 */

add_action( 'admin_init', 'duplicate_post_wpml_init' );

/**
 * Add handlers for WPML compatibility.
 */
function duplicate_post_wpml_init() {
	if ( defined( 'ICL_SITEPRESS_VERSION' ) ) {
		add_action( 'dp_duplicate_page', 'duplicate_post_wpml_copy_translations', 10, 3 );
		add_action( 'dp_duplicate_post', 'duplicate_post_wpml_copy_translations', 10, 3 );
		add_action( 'shutdown', 'duplicate_wpml_string_packages', 11 );
	}
}

global $duplicated_posts;

// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals -- Reason: Renaming a global variable is a BC break.
$duplicated_posts = [];

/**
 * Copy post translations.
 *
 * @global SitePress $sitepress        Instance of the Main WPML class.
 * @global array     $duplicated_posts Array of duplicated posts.
 *
 * @param int     $post_id ID of the copy.
 * @param WP_Post $post    Original post object.
 * @param string  $status  Status of the new post.
 */
function duplicate_post_wpml_copy_translations( $post_id, $post, $status = '' ) {
	global $sitepress;
	global $duplicated_posts;

remove_action( 'dp_duplicate_page', 'duplicate_post_wpml_copy_translations', 10 );
	remove_action( 'dp_duplicate_post', 'duplicate_post_wpml_copy_translations', 10 );

$current_language = $sitepress->get_current_language();
	$trid             = $sitepress->get_element_trid( $post->ID );
	if ( ! empty( $trid ) ) {
		$translations = $sitepress->get_element_translations( $trid );
		$new_trid     = $sitepress->get_element_trid( $post_id );
		foreach ( $translations as $code => $details ) {
			if ( $code !== $current_language ) {
				if ( $details->element_id ) {
					$translation = get_post( $details->element_id );
					if ( ! $translation ) {
						continue;
					}
					$new_post_id = duplicate_post_create_duplicate( $translation, $status );
					if ( ! is_wp_error( $new_post_id ) ) {
						$sitepress->set_element_language_details(
							$new_post_id,
							'post_' . $translation->post_type,
							$new_trid,
							$code,
							$current_language
						);
					}
				}
			}
		}

// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals -- Reason: see above.
		$duplicated_posts[ $post->ID ] = $post_id;
	}
}

/**
 * Duplicate string packages.
 *
 * @global array() $duplicated_posts Array of duplicated posts.
 */
function duplicate_wpml_string_packages() { // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals -- Reason: renaming the function would be a BC-break.
	global $duplicated_posts;

foreach ( $duplicated_posts as $original_post_id => $duplicate_post_id ) {
		// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals -- Reason: using WPML native filter.
		$original_string_packages = apply_filters( 'wpml_st_get_post_string_packages', false, $original_post_id );

// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals -- Reason: using WPML native filter.
		$new_string_packages = apply_filters( 'wpml_st_get_post_string_packages', false, $duplicate_post_id );

if ( is_array( $original_string_packages ) ) {
			foreach ( $original_string_packages as $original_string_package ) {
				$translated_original_strings = $original_string_package->get_translated_strings( [] );

foreach ( $new_string_packages as $new_string_package ) {
					$cache = new WPML_WP_Cache( 'WPML_Package' );
					$cache->flush_group_cache();
					$new_strings = $new_string_package->get_package_strings();
					foreach ( $new_strings as $new_string ) {

if ( isset( $translated_original_strings[ $new_string->name ] ) ) {
							foreach ( $translated_original_strings[ $new_string->name ] as $language => $translated_string ) {

do_action(
									// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals -- Reason: using WPML native filter.
									'wpml_add_string_translation',
									$new_string->id,
									$language,
									$translated_string['value'],
									$translated_string['status']
								);
							}
						}
					}
				}
			}
		}
	}
}

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