WC_Shipping_Zone::delete_shipping_method PHP Method

    public function delete_shipping_method($instance_id)
    {
        if (null === $this->get_id()) {
            return false;
        }
        $this->data_store->delete_method($instance_id);
        do_action('woocommerce_shipping_zone_method_deleted', $instance_id, $this->get_id());
        WC_Cache_Helper::get_transient_version('shipping', true);
        return true;
    }

    /**
     * shipping_zone_methods function.
     * 
     * @access public
     * @return void
     */
    function shipping_zone_methods($zone_id)
    {
        global $woocommerce, $wpdb;
        $zone = new WC_Shipping_Zone($zone_id);
        if (!$zone->exists()) {
            wp_redirect(remove_query_arg('zone'));
            exit;
        }
        if (!empty($_GET['add_method']) && !empty($_GET['method_type']) && !empty($_GET['_wpnonce']) && wp_verify_nonce($_GET['_wpnonce'], 'woocommerce_add_method')) {
            $type = strtolower(trim($_GET['method_type']));
            if ($method_id = $zone->add_shipping_method($type)) {
                wp_redirect(add_query_arg('method', $method_id, add_query_arg('zone', $zone_id, admin_url('admin.php?page=shipping_zones'))));
                exit;
                //echo '<div class="updated success"><p>' . __( 'Shipping method successfully added', 'wc_table_rate' ) . ' <a href="' . add_query_arg( 'method', $method_id, add_query_arg( 'zone', $zone_id, admin_url( 'admin.php?page=shipping_zones' ) ) ) . '" class="button" style="margin-left: 10px;">' . __( 'Configure method', 'wc_table_rate' ) . '</a></p></div>';
            }
        }
        if (!empty($_GET['delete_method']) && !empty($_GET['_wpnonce']) && wp_verify_nonce($_GET['_wpnonce'], 'woocommerce_delete_method')) {
            $method_id = absint($_GET['delete_method']);
            if ($zone->delete_shipping_method($method_id)) {
                echo '<div class="updated success"><p>' . __('Shipping method successfully deleted', 'wc_table_rate') . '</p></div>';
            }
        }
        if (!empty($_GET['method']) && $_GET['method'] > 0) {
            $method_id = (int) $_GET['method'];
            $this->shipping_zone_method_settings($zone, $method_id);
            return;
        }
        ?>
		<div class="wrap woocommerce">
			<div class="icon32 icon32-woocommerce-delivery" id="icon-woocommerce"><br /></div>
			<h2><a href="<?php 
        echo admin_url('admin.php?page=shipping_zones');
        ?>
"><?php 
        _e('Shipping Zones', 'wc_table_rate');
        ?>
</a> &gt; <?php 
        echo $zone->zone_name;
        ?>
 <a href="<?php 
        echo wp_nonce_url(add_query_arg('method_type', 'table_rate', add_query_arg('add_method', 'true')), 'woocommerce_add_method');
        ?>
" class="add-new-h2"><?php 
        _e('Add Shipping Method', 'wc_table_rate');
        ?>
</a></h2>
			
			<?php 
        $this->list_shipping_zone_methods();
        ?>
	
		</div>
		<?php 
        $woocommerce->add_inline_js("\n\t\t\t// Delete\n\t\t\tjQuery('a.submitdelete').click( function(){\n\t\t\t\tvar answer = confirm('" . __('Are you sure you want to delete this method?', 'wc_table_rate') . "');\n\t\t\t\tif ( answer ) {\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\t\t\t\treturn false;\n\t\t\t});\n\t\t");
    }