hide free shipping bar if certail shipping class product is present in the cart

hide-free-shipping-bar-if-shipping-class-in-cart.php

<?php

add_filter('pisol_fsnw_final_ajax_filter', 'disableFreeShippingBarForClassOfProduct');
function disableFreeShippingBarForClassOfProduct($json){
	  $shipping_classes = array(128); // shipping class id for which the free shipping bar will be hidden
    $if_exists = false;

    foreach( WC()->cart->cart_contents as $key => $values ){
        if( in_array( $values[ 'data' ]->get_shipping_class_id(), $shipping_classes ) ){
            $if_exists = true;
		     }
	  }
  
    if( $if_exists ) return false;

    return $json;
}