main

<?php

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class WPML_Sync_Custom_Fields {

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    /** @var WPML_Translation_Element_Factory $element_factory */

    private $element_factory;

​

    /** @var array $fields_to_sync */

    private $fields_to_sync;

​

    /**

     * WPML_Sync_Custom_Fields constructor.

     *

     * @param WPML_Translation_Element_Factory $element_factory

     * @param array                            $fields_to_sync

     */

    public function __construct( WPML_Translation_Element_Factory $element_factory, array $fields_to_sync ) {

        $this->element_factory = $element_factory;

        $this->fields_to_sync  = $fields_to_sync;

    }

​

    /**

     * @param int    $post_id_from

     * @param string $meta_key

     */

    public function sync_to_translations( $post_id_from, $meta_key ) {

        if ( in_array( $meta_key, $this->fields_to_sync, true ) ) {

            $post_element = $this->element_factory->create( $post_id_from, 'post' );

            $translations = $post_element->get_translations();

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            foreach ( $translations as $translation ) {

                $translation_id = $translation->get_element_id();

                if ( $translation_id !== $post_id_from ) {

                    $this->sync_custom_field( $post_id_from, $translation_id, $meta_key );

                }

            }

        }

    }

​

    /**

     * @param int $post_id_from

     */

    public function sync_all_custom_fields( $post_id_from ) {

        foreach ( $this->fields_to_sync as $meta_key ) {

            $this->sync_to_translations( $post_id_from, $meta_key );

        }

    }

​

    /**

     * @param int    $post_id_from

     * @param int    $post_id_to

     * @param string $meta_key

     */

    public function sync_custom_field( $post_id_from, $post_id_to, $meta_key ) {

        $custom_fields_from = get_post_meta( $post_id_from );

        $custom_fields_to   = get_post_meta( $post_id_to );

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        $values_from = isset( $custom_fields_from[ $meta_key ] ) ? $custom_fields_from[ $meta_key ] : [];

        $values_to   = isset( $custom_fields_to[ $meta_key ] ) ? $custom_fields_to[ $meta_key ] : [];

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        $removed = array_diff( $values_to, $values_from );

        foreach ( $removed as $v ) {

            delete_post_meta( $post_id_to, $meta_key, maybe_unserialize( $v ) );

        }

​

        $added = array_diff( $values_from, $values_to );

        foreach ( $added as $v ) {

            $copied_value = maybe_unserialize( $v );

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            /**

             * Filters the $copied_value of $meta_key which will be copied from $post_id_from to $post_id_to

             *

             * @param mixed  $copied_value The unserialized and slashed value.

             * @param int    $post_id_from The ID of the source post.

             * @param int    $post_id_to   The ID of the destination post.

             * @param string $meta_key     The key of the post meta being copied.

             *

             * @since 4.3.0

             */

            $copied_value = apply_filters( 'wpml_sync_custom_field_copied_value', $copied_value, $post_id_from, $post_id_to, $meta_key );

​

            $copied_value = wp_slash( $copied_value );

            add_post_meta( $post_id_to, $meta_key, $copied_value );

        }

​

        do_action( 'wpml_after_copy_custom_field', $post_id_from, $post_id_to, $meta_key );

    }

​

}