ChromeOrange

/**
 * Check the cart for specific products, remove Free Shipping if they are present
 *
 * Free Shipping method must be enabled
 *
 * Add the code to your theme functions.php file
 */
add_filter( 'woocommerce_available_shipping_methods', 'free_shipping_when_product_in_cart' , 10, 1 );
 
function free_shipping_when_product_in_cart( $available_methods ) {

ChromeOrange

/**
 * Deactivate USPS Shipping if products with specific shipping 
 * classes are in the cart
 *
 * Add the shipping class slugs to the $shippingclass_array array
 */
add_filter( 'woocommerce_shipping_usps_is_available', 'unset_woocommerce_shipping_methods_usps', 10 ,2 );
function unset_woocommerce_shipping_methods_usps ( $return, $package ) {

	// Setup an array of shipping classes that do not allow USPS Shipping

ChromeOrange

/**
 * Check the cart for specific products, remove specific USPS Shipping methods if they are present
 *
 * Add the code to your theme functions.php file
 */
add_filter( 'woocommerce_package_rates', 'unset_usps_shipping_methods' , 10, 2 );
function unset_usps_shipping_methods( $rates, $package ) {

	/**
	 * Setup an array or products

ChromeOrange

/**
 * Set the store base city and postcode / zipcode
 */
add_filter( 'woocommerce_countries_base_city' , 'set_woocommerce_countries_base_city' );
function set_woocommerce_countries_base_city() {
	// Replace with your store town/city
	return 'Townland';
}

add_filter( 'woocommerce_countries_base_postcode' , 'set_woocommerce_countries_base_postcode' );

ChromeOrange

/**
 * Round Shipping in the event of PayPal errors
 */
add_filter( 'woocommerce_package_rates', 'fix_shipping_rounding_errors' , 10, 2 );

/**
 *
 */
function fix_shipping_rounding_errors( $rates, $package ) {
 

ChromeOrange

/**
 * Remove USPS Flat rate envelopes from the available options
 * Once added the customer will not see any rates for envelopes
 */
add_filter( 'usps_flat_rate_boxes', 'custom_usps_flat_rate_boxes' );
function custom_usps_flat_rate_boxes( $flat_rate_boxes ) {

	unset($flat_rate_boxes["d29"]);
	unset($flat_rate_boxes["d30"]);
	unset($flat_rate_boxes["d63"]);

ChromeOrange

/**
 * USPS 4.0 introduced the ability for envelopes to be flexible you can disable this with this function
 * Simply set the type to 'envelope' instead of 'package' for any of the flat rate services that USPS lists as envelopes
 */

add_filter( 'usps_flat_rate_boxes', 'custom_usps_flat_rate_boxes' );
function custom_usps_flat_rate_boxes( $flat_rate_boxes ) {
    
    // Priority Mail Express Envelopes
    $flat_rate_boxes["d13"]["type"] = 'envelope';

ChromeOrange

/**
 * Set maximum shipping cost depending on delivery country in WooCommerce
 */
add_filter( 'woocommerce_package_rates' , 'woocommerce_set_maximum_shipping_cost', 10, 2 );
function woocommerce_set_maximum_shipping_cost( $rates, $package ) {

	/**
	 * Create an array of countries for a maximum shipping cost
	 * eg array('US','CA'); 
	 * for US and Canada.

ChromeOrange

/**
 * Set maximum shipping cost for specific Table Rate shipping methods
 */
add_filter( 'woocommerce_package_rates' , 'woocommerce_set_maximum_shipping_cost', 10, 2 );
function woocommerce_set_maximum_shipping_cost( $rates, $package ) {

	foreach( $rates as $rate ) {
		/**
		 * Change 10 to your maximum shipping cost and the label to match your Method Title
		 * shown here https://dl.dropboxusercontent.com/s/5q9hfei3hgnbnt9/2014-10-13%20at%2001.25%20%281%29.png?dl=0

ChromeOrange

add_filter('usps_disable_first_class_rate_first-class-mail-parcel', '__return_true');
add_filter('usps_disable_first_class_rate_first-class-mail-large-envelope', '__return_true');
add_filter('usps_disable_first_class_rate_first-class-mail-stamped-letter', '__return_true');
add_filter('usps_disable_first_class_rate_first-class-mail-postcards', '__return_true');