Woocommerce Shipping based rate

shipping_based_weight.php

add_filter( 'woocommerce_package_rates', 'ras_custom_shipping_costs', 20, 2 );
function ras_custom_shipping_costs( $rates, $package ) {

	$weights_prices_field = get_field('shipping_weights', 'options');
	$weights_prices = [];
	foreach ($weights_prices_field as $weights_price) {
		$weights_prices[floatval($weights_price['weight'])] = floatval($weights_price['price']);
	}

	foreach( $rates as $rate_key => $rate ){
		if( $rate->method_id == 'flat_rate'){
			$new_cost = $rates[$rate_key]->cost;
			$cart_weight = WC()->cart->get_cart_contents_weight();
			foreach ($weights_prices as $weight => $price) {
				if($cart_weight > $weight )
					$new_cost = $price;

			}

			$rates[$rate_key]->cost = $new_cost;
		}
	}
	return $rates;
}