[Closed] I need help with proper code to make my custom fields copy when adding translation

<?php
/**
 * One-off: mark all meta keys starting with "product_side_variation_image_"
 * as copy custom fields in WPML.
 *
 * Run via wp eval-file OR drop as temp MU plugin and call
 * gb_wpml_mark_test_fields_translate() once.
 */

function gb_wpml_mark_test_fields_translate() {
    if ( ! function_exists( 'get_option' ) ) {
        return;
    }

    if ( ! is_admin() || ! current_user_can( 'manage_options' ) ) {
        return;
    }

    global $wpdb;

    // 1) Collect all distinct meta_keys that match your prefix.
    $meta_keys = $wpdb->get_col(
        $wpdb->prepare(
            "SELECT DISTINCT meta_key
             FROM {$wpdb->postmeta}
             WHERE meta_key LIKE %s",
            'product_side_variation_image_%'
        )
    );

    if ( empty( $meta_keys ) ) {
        wp_die( 'No meta keys found for prefix product_side_variation_image_.' );
    }

    // 2) Read WPML settings via hooks (wpml_setting / wpml_sub_setting).
    // This is effectively a wrapper around icl_sitepress_settings.
    $tm_settings = apply_filters( 'wpml_setting', array(), 'translation-management' );
    $cf_translation = apply_filters(
        'wpml_sub_setting',
        array(),
        'translation-management',
        'custom_fields_translation'
    );

    if ( ! is_array( $tm_settings ) ) {
        $tm_settings = array();
    }
    if ( ! is_array( $cf_translation ) ) {
        $cf_translation = array();
    }

    // 3) Mark all matching keys as "Translate".
    // If constants are not loaded for some reason, fall back to 2.
    if ( defined( 'WPML_COPY_CUSTOM_FIELD' ) ) {
        $translate_value = WPML_COPY_CUSTOM_FIELD;
    } else {
        $translate_value = 2;
    }

    $changed = 0;

    foreach ( $meta_keys as $key ) {
        if ( ! isset( $cf_translation[ $key ] ) || (int) $cf_translation[ $key ] !== $translate_value ) {
            $cf_translation[ $key ] = $translate_value;
            $changed++;
        }
    }

    // 4) Write back into the full icl_sitepress_settings option.
    $all_settings = get_option( 'icl_sitepress_settings' );
    if ( ! is_array( $all_settings ) ) {
        $all_settings = array();
    }

    if ( ! isset( $all_settings['translation-management'] ) || ! is_array( $all_settings['translation-management'] ) ) {
        $all_settings['translation-management'] = array();
    }

    $all_settings['translation-management']['custom_fields_translation'] = $cf_translation;

    update_option( 'icl_sitepress_settings', $all_settings );

    wp_die(
        sprintf(
            'Done. Marked %d meta keys starting with "product_side_variation_image_" as copied (WPML_COPY_CUSTOM_FIELD).',
            $changed
        )
    );
}

// Example trigger: /wp-admin/?run_wpml_test_fields_translate=1
add_action( 'admin_init', function () {
    if ( isset( $_GET['run_wpml_test_fields_translate'] ) ) {
        gb_wpml_mark_test_fields_translate();
    }
} );