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<?php

​

class WPML_Translate_Link_Targets_In_Custom_Fields extends WPML_Translate_Link_Targets {

​

    /* @var TranslationManagement $tm_instance */

    private $tm_instance;

    /* @var WPML_WP_API $wp_api */

    private $wp_api;

    /* @var array $meta_keys */

    private $meta_keys;

​

    /**

     * WPML_Translate_Link_Targets_In_Custom_Fields constructor.

     *

     * @param TranslationManagement       $tm_instance

     * @param WPML_WP_API                 $wp_api

     * @param AbsoluteLinks               $absolute_links

     * @param WPML_Absolute_To_Permalinks $permalinks_converter

     */

    public function __construct( &$tm_instance, &$wp_api, $absolute_links, $permalinks_converter ) {

        parent::__construct( $absolute_links, $permalinks_converter );

        $this->tm_instance = &$tm_instance;

        $this->wp_api      = &$wp_api;

​

        $this->tm_instance->load_settings_if_required();

        if ( isset( $this->tm_instance->settings['custom_fields_translate_link_target'] ) &&

                ! empty( $this->tm_instance->settings['custom_fields_translate_link_target'] ) ) {

​

            $this->meta_keys = $this->tm_instance->settings['custom_fields_translate_link_target'];

        }

    }

​

    public function has_meta_keys() {

        return (bool) $this->meta_keys;

    }

​

    /**

     * maybe_translate_link_targets

     *

     * @param string|array $metadata  - Always null for post metadata.

     * @param int          $object_id - Post ID for post metadata

     * @param string       $meta_key  - metadata key.

     * @param bool         $single    - Indicates if processing only a single $metadata value or array of values.

     *

     * @return string|array Original or Modified $metadata.

     */

    public function maybe_translate_link_targets( $metadata, $object_id, $meta_key, $single ) {

​

        if ( array_key_exists( $meta_key, $this->meta_keys ) ) {

            $custom_field_setting = new WPML_Post_Custom_Field_Setting( $this->tm_instance, $meta_key );

            if ( $custom_field_setting->is_translate_link_target() ) {

​

                $sub_fields = $custom_field_setting->get_translate_link_target_sub_fields();

​

                $this->wp_api->remove_filter( 'get_post_metadata', array( $this, 'maybe_translate_link_targets' ), 10 );

                $metadata_raw = maybe_unserialize( $this->wp_api->get_post_meta( $object_id, $meta_key, $single ) );

                $this->wp_api->add_filter( 'get_post_metadata', array( $this, 'maybe_translate_link_targets' ), 10, 4 );

​

                if ( $metadata_raw ) {

                    if ( $single ) {

                        $metadata_raw = array( $metadata_raw );

                    }

                    foreach ( $metadata_raw as $index => $metadata ) {