Shipping stuff

shipping.php

add_filter( 'woocommerce_package_rates', 'determine_shipping_rate', 10, 2 );
function determine_shipping_rate( $rates, $package ) {
  // Set weight variable
  $cart_weight = 0;

  // Calculate cart's total
  foreach( WC()->cart->cart_contents as $key => $value)
    $cart_weight += $value['data']->weight * $value['quantity'];
 
  if( $cart_weight > 45.45) {  // may have to convert to pounds if necessary
    foreach($rates as $key => $value) {
      $rates[$key] -> cost += 10;
    }
  }
  
  if( WC()->customer->shipping_state != "AB"){
    foreach($rates as $key => $value) {
      $rates[$key] -> cost += 0.25 * $cart_weight;
    }
  }
  
  return $rates;
}