duplicate-post-wpml.php

<?php
add_action( 'admin_init', 'duplicate_post_wpml_init' );

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;
$duplicated_posts= array();

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 );
                    $new_post_id = duplicate_post_create_duplicate( $translation, $status );
                    $sitepress->set_element_language_details( $new_post_id, 'post_' . $translation->post_type, $new_trid, $code, $current_language );
                }
            }
        }
        $duplicated_posts[ $post->ID ] = $post_id;
    }
}

function duplicate_wpml_string_packages() {
    global $duplicated_posts;

    foreach ( $duplicated_posts as $original_post_id => $duplicate_post_id ) {

        $original_string_packages = apply_filters( 'wpml_st_get_post_string_packages', false, $original_post_id );
        $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( array() );

                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(
                                    'wpml_add_string_translation',
                                    $new_string->id,
                                    $language,
                                    $translated_string['value'],
                                    $translated_string['status']
                                );

                            }
                        }

                    }

                }

            }
        }
    }
}

?>