debugging WC_Shipping_Method packages - wordpress

Question

I have created an extended class out of WC_Shipping_Method and needed to debug and printout $packages in calculate_shipping method.
var_dump is not showing anything on screen. Is there anyway to display the content of such variable?
Another issue I noticed that $this->title is not changed, I run it first time and the shipment name is somehow become fixed!
function tutsplus_shipping_method() {
if ( ! class_exists( 'TutsPlus_Shipping_Method' ) ) {
class TutsPlus_Shipping_Method extends WC_Shipping_Method {
/**
* Constructor for your shipping class
*
* #access public
* #return void
*/
public function __construct() {
$this->id = 'tutsplus';
$this->method_title = __( 'TutsPlus Shipping', 'tutsplus' );
$this->method_description = __( 'Custom Shipping Method for TutsPlus', 'tutsplus' );
// Availability & Countries
$this->availability = 'including';
$this->countries = array(
'US', // Unites States of America
'CA', // Canada
'DE', // Germany
'GB', // United Kingdom
'IT', // Italy
'ES', // Spain
'HR' // Croatia
);
$this->init();
$this->enabled = isset( $this->settings['enabled'] ) ? $this->settings['enabled'] : 'yes';
$this->title = isset( $this->settings['title'] ) ? $this->settings['title'] : __( 'TutsPlus Shipping', 'tutsplus' );
}
/**
* Init your settings
*
* #access public
* #return void
*/
function init() {
// Load the settings API
$this->init_form_fields();
$this->init_settings();
// Save settings in admin if you have any defined
add_action( 'woocommerce_update_options_shipping_' . $this->id, array( $this, 'process_admin_options' ) );
}
/**
* Define settings field for this shipping
* #return void
*/
function init_form_fields() {
$this->form_fields = array(
'enabled' => array(
'title' => __( 'Enable', 'tutsplus' ),
'type' => 'checkbox',
'description' => __( 'Enable this shipping.', 'tutsplus' ),
'default' => 'yes'
),
'title' => array(
'title' => __( 'Title', 'tutsplus' ),
'type' => 'text',
'description' => __( 'Title to be display on site', 'tutsplus' ),
'default' => __( 'TutsPlus Shipping', 'tutsplus' )
),
'weight' => array(
'title' => __( 'Weight (kg)', 'tutsplus' ),
'type' => 'number',
'description' => __( 'Maximum allowed weight', 'tutsplus' ),
'default' => 100
),
);
}
/**
* This function is used to calculate the shipping cost. Within this function we can check for weights, dimensions and other parameters.
*
* #access public
* #param mixed $package
* #return void
*/
public function calculate_shipping( $package ) {
$weight = 0;
$cost = 0;
$country = $package["destination"]["country"];
foreach ( $package['contents'] as $item_id => $values )
{
$_product = $values['data'];
$weight = $weight + $_product->get_weight() * $values['quantity'];
}
$weight = wc_get_weight( $weight, 'kg' );
if( $weight <= 10 ) {
$cost = 0;
} elseif( $weight <= 30 ) {
$cost = 5;
} elseif( $weight <= 50 ) {
$cost = 10;
} else {
$cost = 20;
}
$countryZones = array(
'HR' => 0,
'US' => 3,
'GB' => 2,
'CA' => 3,
'ES' => 2,
'DE' => 1,
'IT' => 1
);
$zonePrices = array(
0 => 10,
1 => 30,
2 => 50,
3 => 70
);
$zoneFromCountry = $countryZones[ $country ];
$priceFromZone = $zonePrices[ $zoneFromCountry ];
$cost += $priceFromZone;
$rate = array(
'id' => $this->id,
'label' => $this->title,
'cost' => $cost
);
$this->add_rate( $rate );
}
}
}
}
add_action( 'woocommerce_shipping_init', 'tutsplus_shipping_method' );
function add_tutsplus_shipping_method( $methods ) {
$methods[] = 'TutsPlus_Shipping_Method';
return $methods;
}
add_filter( 'woocommerce_shipping_methods', 'add_tutsplus_shipping_method' );
function tutsplus_validate_order( $posted ) {
$packages = WC()->shipping->get_packages();
$chosen_methods = WC()->session->get( 'chosen_shipping_methods' );
if( is_array( $chosen_methods ) && in_array( 'tutsplus', $chosen_methods ) ) {
foreach ( $packages as $i => $package ) {
if ( $chosen_methods[ $i ] != "tutsplus" ) {
continue;
}
$TutsPlus_Shipping_Method = new TutsPlus_Shipping_Method();
$weightLimit = (int) $TutsPlus_Shipping_Method->settings['weight'];
$weight = 0;
foreach ( $package['contents'] as $item_id => $values )
{
$_product = $values['data'];
$weight = $weight + $_product->get_weight() * $values['quantity'];
}
$weight = wc_get_weight( $weight, 'kg' );
if( $weight > $weightLimit ) {
$message = sprintf( __( 'Sorry, %d kg exceeds the maximum weight of %d kg for %s', 'tutsplus' ), $weight, $weightLimit, $TutsPlus_Shipping_Method->title );
$messageType = "error";
if( ! wc_has_notice( $message, $messageType ) ) {
wc_add_notice( $message, $messageType );
}
}
}
}
}
add_action( 'woocommerce_review_order_before_cart_contents', 'tutsplus_validate_order' , 10 );
add_action( 'woocommerce_after_checkout_validation', 'tutsplus_validate_order' , 10 );