Remove the sales price and use regular price when the stock is zero in WooCommerce

functions.php

// Remove sale price and use regular price when stock is 0
function remove_sale_price_on_zero_stock( $price, $product ) {
    // Check if the product is on sale and has stock
    if ( $product->is_on_sale() && $product->get_stock_quantity() <= 0 ) {
        $regular_price = $product->get_regular_price();
        $price = wc_price( $regular_price ); // Use regular price instead of sale price
    }
    return $price;
}
add_filter( 'woocommerce_product_get_price', 'remove_sale_price_on_zero_stock', 10, 2 );
add_filter( 'woocommerce_product_get_regular_price', 'remove_sale_price_on_zero_stock', 10, 2 );