woocommerce hide shipping method if free is available php

/**
 * @snippet       Hide one shipping option in one zone when Free Shipping is available
 * @how-to        Get CustomizeWoo.com FREE
 * @author        Rodolfo Melogli
 * @compatible    WooCommerce 3.6.3
 * @donate $9     https://businessbloomer.com/bloomer-armada/
 */
  
add_filter( 'woocommerce_package_rates', 'bbloomer_unset_shipping_when_free_is_available_in_zone', 10, 2 );
   
function bbloomer_unset_shipping_when_free_is_available_in_zone( $rates, $package ) {
      
// Only unset rates if free_shipping is available
if ( isset( $rates['free_shipping:8'] ) ) {
     unset( $rates['flat_rate:1'] );
}     
     
return $rates;
  
}