$field .= '<select name="' . esc_attr( $key ) . '" id="' . esc_attr( $args['id'] ) . '" class="state_select ' . esc_attr( implode( ' ', $args['input_class'] ) ) . '" ' . implode( ' ', $custom_attributes ) . ' data-placeholder="' . esc_attr( $args['placeholder'] ? $args['placeholder'] : esc_html__( 'Select an option&hellip;', 'woocommerce' ) ) . '"  data-input-classes="' . esc_attr( implode( ' ', $args['input_class'] ) ) . '">