Code-Snippets-Functions/Execute a function on a child site/WooCommerce/send-email-notification-given-the-language-in-order-placed.txt

add_filter( 'woocommerce_allow_switching_email_locale', 'set_email_locale_based_on_order', 10, 2 );
add_action( 'woocommerce_email_footer', 'restore_email_locale' );

function map_language_to_locale( $language_slug ) {
    // Here we have defined a mapping of language slugs to locale codes.
    $mapping = array(
        'de' => 'de_DE',
        'en' => 'en_US',
        'pt' => 'pt_BR',
    );

    return isset($mapping[$language_slug]) ? $mapping[$language_slug] : false;
}

function get_locale_from_order_id( $order_id ) {
    if ( function_exists( 'pll_get_post_language' ) ) {
        $order_language = pll_get_post_language($order_id, 'slug');
        return map_language_to_locale( $order_language );
    }
    return null;
}

function set_email_locale_based_on_order( $email_locale, $email )
{
    // This is to ensure the email object is of type WC_Order.
    if ( isset( $email->object ) && is_a( $email->object, 'WC_Order' ) ) {
        $order_id = $email->object->get_id(); // We need to use get_id() method to get the order ID.
        $locale   = get_locale_from_order_id( $order_id );

        // Add error logging for debugging
        error_log( 'Order ID: ' . $order_id ); // This is to Log the order ID.
        error_log( 'Locale: ' . $locale ); // This is to Log the locale.

        if ( $locale ) {
            global $current_locale;
            $current_locale = get_locale(); // Here we are saving the current locale.
            switch_to_locale( $locale ); // Here we are switching to the order's locale.

            // This is to Log the locale switch.
            error_log( 'Switched to locale: ' . $locale );

            // Here we are using filter on plugin_locale so load_plugin_textdomain loads the correct locale.
            add_filter( 'plugin_locale', fn() => $locale );
        }
    }

    return $email_locale;
}

function restore_email_locale() {
    global $current_locale;
    if ( isset( $current_locale ) ) {
        switch_to_locale( $current_locale ); // Restore the original locale
    }
}