structure-wc-global.php

/**
 * Calculates discount percentage for the product sale bubble for
 * simple, variable or external product types. Returns base bubble text
 * with or without formatting otherwise.
 *
* @param $product
 *
* @return string
 */
function flatsome_presentage_bubble( $product ) {
    
    // WC Dynamic compatible
    if (class_exists('WC_Dynamic_Pricing')) {
        $dynamic_pricing = WC_Dynamic_Pricing::instance();
    }
    
	if ( $product->is_type( 'simple' ) || $product->is_type( 'external' ) ) {
		$regular_price  = $product->get_regular_price();
		$sale_price     = $product->get_sale_price();
         // WC Dynamic compatible
        if (class_exists('WC_Dynamic_Pricing')) {
            $sale_price     = $dynamic_pricing->on_get_price( $regular_price, $product, false );
        }
		$bubble_content = round( ( ( floatval( $regular_price ) - floatval( $sale_price ) ) / floatval( $regular_price ) ) * 100 );

                
	} elseif ( $product->is_type( 'variable' ) ) {
		$available_variations = $product->get_available_variations();
		$maximumper           = 0;

		for ( $i = 0; $i < count( $available_variations ); ++ $i ) {
			$variation_id     = $available_variations[ $i ]['variation_id'];
			$variable_product = new WC_Product_Variation( $variation_id );
			if ( ! $variable_product->is_on_sale() ) {
				continue;
			}
			$regular_price = $variable_product->get_regular_price();
			$sale_price    = $variable_product->get_sale_price();
             // WC Dynamic compatible
            if (class_exists('WC_Dynamic_Pricing')) {
                $sale_price     = $dynamic_pricing->on_get_price( $regular_price, $variable_product, false );
            }
			$percentage    = round( ( ( floatval( $regular_price ) - floatval( $sale_price ) ) / floatval( $regular_price ) ) * 100 );
			if ( $percentage > $maximumper ) {
				$maximumper = $percentage;
			}
		}
		$bubble_content = sprintf( __( '%s', 'woocommerce' ), $maximumper );
	} else {
		// Set default and return if the product type doesn't meet specification.
		$bubble_content = __( 'Sale!', 'woocommerce' );

		return $bubble_content;
	}

	// Process custom formatting. Keep mod value double check to process % for default parameter (See sprintf()).
	$formatting = get_theme_mod( 'sale_bubble_percentage_formatting' );
	$formatting = $formatting ? $formatting : '-{value}%';
	$bubble_content = str_replace( '{value}', $bubble_content, $formatting );

	return $bubble_content;
}