Bring weight filter

bring-weight-filter.php

<?php

/**
 * Filter the bring shipping rates.
 * Sets the price of the chosen services based on weight
 */
add_filter( 'bring_shipping_rates', function( $rates ) {
	// Configure services and prices.
	$services = [ 'SERVICEPAKKE', '5800' ];
	$prices   = [
		'1kg'  => 199,
		'5kg'  => 299,
		'10kg' => 399,
	];

	// Calculate the weight of items in cart.
	$total_weight = 0;
	$items = WC()->cart->get_cart();
	foreach ( $items as $item ) {
		if ( ! $item['data']->needs_shipping() ) {
			continue;
		}
		$total_weight += $item['data']->get_weight() * $item['quantity'];
	}
	// Convert the total weight to grams.
	$total_weight = wc_get_weight( $total_weight, 'g' );

	// Calculate the price for the current weight.
	$price = false;
	foreach ( $prices as $threshold => $cost ) {
		// Find the value and weight unit.
		if ( ! preg_match( '/^(\d+)\s*(kg|g|lbs|oz)$/', $threshold, $matches ) ) {
			continue;
		}
		$weight_unit = $matches[2];
		$weight      = wc_get_weight( $matches[1], 'g', $weight_unit );
		if ( $total_weight > $weight ) {
			$price = $cost;
		}
	}

	// Return early if the total weight is less than the lowest price threshold.
	if ( false === $price ) {
		return $rates;
	}

	// Set the price for the chosen services.
	foreach ( $rates as &$rate ) {
		if ( in_array( $rate['bring_product'], $services ) ) {
			$rate['cost'] = $price;
		}
	}

	return $rates;
}, 999 );