get_wc_emails(); $default = isset( $current_settings['attach_to_email_ids'] ) ? array_keys( array_filter( $current_settings['attach_to_email_ids'], function( $value ) { return $value === '1'; } ) ) : array(); $attach_to_setting = array( 'option_name' => 'wcpdf_settings[wpo_wcpdf_documents_settings_invoice]', 'id' => 'attach_to_email_ids', 'options' => $wc_emails, 'multiple' => true, 'enhanced_select' => true, 'default' => $default, ); WPO_WCPDF()->settings->callbacks->select( $attach_to_setting ); ?>