Add highlighting to an add to cart button for WooCommerce products which are on sale. [datafeedr]

add-highlighting-to-button-for-sale-products.php

<?php

/**
 * Add highlighting to an add to cart button for WooCommerce products which are on sale.
 *
 * @param string $html
 * @param WC_Product $product
 * @param array $args
 *
 * @return string
 */
function mycode_display_highlighted_add_to_cart_button_for_products_on_sale( $html, $product, $args ) {

	if ( ! $product->is_on_sale() ) {
		return $html;
	}

	$extra_class = ' alt';
	$extra_text  = ' SALE';

	$url        = $product->add_to_cart_url();
	$quantity   = isset( $args['quantity'] ) ? $args['quantity'] : 1;
	$class      = isset( $args['class'] ) ? $args['class'] . $extra_class : 'button' . $extra_class;
	$attributes = isset( $args['attributes'] ) ? wc_implode_html_attributes( $args['attributes'] ) : '';
	$text       = $product->add_to_cart_text() . $extra_text;

	$format = '<a href="%1$s" data-quantity="%2$s" class="%3$s" %4$s>%5$s</a>';

	return sprintf(
		$format,
		esc_url( $url ),
		esc_attr( $quantity ),
		esc_attr( $class ),
		$attributes,
		esc_html( $text )
	);
}

add_filter( 'woocommerce_loop_add_to_cart_link', 'mycode_display_highlighted_add_to_cart_button_for_products_on_sale', 20, 3 );