/wp-content/plugins/woocommerce/includes/shipping/flat-rate/class-wc-shipping-flat-rate.php

<?php

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

/**
 * Flat Rate Shipping Method
 *
 * A simple shipping method for a flat fee per item or per order
 *
 * @class 		WC_Shipping_Flat_Rate
 * @version		2.0.0
 * @package		WooCommerce/Classes/Shipping
 * @author 		WooThemes
 */
class WC_Shipping_Flat_Rate extends WC_Shipping_Method {

	/**
	 * __construct function.
	 *
	 * @access public
	 * @return void
	 */
	function __construct() {
		$this->id 						= 'flat_rate';
		$this->method_title 			= __( 'Flat Rate', 'woocommerce' );
		$this->flat_rate_option 		= 'woocommerce_flat_rates';
		$this->method_description 		= __( 'Flat rates let you define a standard rate per item, or per order.', 'woocommerce' );

		add_action( 'woocommerce_update_options_shipping_' . $this->id, array( $this, 'process_admin_options' ) );
		add_action( 'woocommerce_update_options_shipping_' . $this->id, array( $this, 'process_flat_rates' ) );
		add_filter( 'woocommerce_settings_api_sanitized_fields_' . $this->id, array( $this, 'save_default_costs' ) );

		$this->init();
	}

	/**
	 * init function.
	 *
	 * @access public
	 * @return void
	 */
	function init() {

		// Load the settings.
		$this->init_form_fields();
		$this->init_settings();

		// Define user set variables
		$this->title 		  = $this->get_option( 'title' );
		$this->availability   = $this->get_option( 'availability' );
		$this->countries 	  = $this->get_option( 'countries' );
		$this->type 		  = $this->get_option( 'type' );
		$this->tax_status	  = $this->get_option( 'tax_status' );
		$this->cost 		  = $this->get_option( 'cost' );
		$this->cost_per_order = $this->get_option( 'cost_per_order' );
		$this->fee 			  = $this->get_option( 'fee' );
		$this->minimum_fee 	  = $this->get_option( 'minimum_fee' );
		$this->options 		  = (array) explode( "\n", $this->get_option( 'options' ) );

		// Load Flat rates
		$this->get_flat_rates();
	}


	/**
	 * Initialise Gateway Settings Form Fields
	 *
	 * @access public
	 * @return void
	 */
	function init_form_fields() {

		$this->form_fields = array(
			'enabled' => array(
							'title' 		=> __( 'Enable/Disable', 'woocommerce' ),
							'type' 			=> 'checkbox',
							'label' 		=> __( 'Enable this shipping method', 'woocommerce' ),
							'default' 		=> 'no',
						),
			'title' => array(
							'title' 		=> __( 'Method Title', 'woocommerce' ),
							'type' 			=> 'text',
							'description' 	=> __( 'This controls the title which the user sees during checkout.', 'woocommerce' ),
							'default'		=> __( 'Flat Rate', 'woocommerce' ),
							'desc_tip'		=> true
						),
			'availability' => array(
							'title' 		=> __( 'Availability', 'woocommerce' ),
							'type' 			=> 'select',
							'default' 		=> 'all',
							'class'			=> 'availability',
							'options'		=> array(
								'all' 		=> __( 'All allowed countries', 'woocommerce' ),
								'specific' 	=> __( 'Specific Countries', 'woocommerce' ),
							),
						),
			'countries' => array(
							'title' 		=> __( 'Specific Countries', 'woocommerce' ),
							'type' 			=> 'multiselect',
							'class'			=> 'chosen_select',
							'css'			=> 'width: 450px;',
							'default' 		=> '',
							'options'		=> WC()->countries->get_shipping_countries(),
							'custom_attributes' => array(
								'data-placeholder' => __( 'Select some countries', 'woocommerce' )
							)
						),
			'tax_status' => array(
							'title' 		=> __( 'Tax Status', 'woocommerce' ),
							'type' 			=> 'select',
							'default' 		=> 'taxable',
							'options'		=> array(
								'taxable' 	=> __( 'Taxable', 'woocommerce' ),
								'none' 		=> _x( 'None', 'Tax status', 'woocommerce' )
							),
						),
			'cost_per_order' => array(
							'title' 		=> __( 'Cost per order', 'woocommerce' ),
							'type' 			=> 'price',
							'placeholder'	=> wc_format_localized_price( 0 ),
							'description'	=> __( 'Enter a cost (excluding tax) per order, e.g. 5.00. Default is 0.', 'woocommerce' ),
							'default'		=> '',
							'desc_tip'		=> true
						),
			'options' => array(
							'title' 		=> __( 'Additional Rates', 'woocommerce' ),
							'type' 			=> 'textarea',
							'description'	=> __( 'Optional extra shipping options with additional costs (one per line): Option Name | Additional Cost [+- Percents] | Per Cost Type (order, class, or item) Example: <code>Priority Mail | 6.95 [+ 0.2%] | order</code>.', 'woocommerce' ),
							'default'		=> '',
							'desc_tip'		=> true,
							'placeholder'	=> __( 'Option Name | Additional Cost [+- Percents%] | Per Cost Type (order, class, or item)', 'woocommerce' )
						),
			'additional_costs' => array(
							'title'			=> __( 'Additional Costs', 'woocommerce' ),
							'type'			=> 'title',
							'description'   => __( 'Additional costs can be added below - these will all be added to the per-order cost above.', 'woocommerce' )
						),
			'type' => array(
							'title' 		=> __( 'Costs Added...', 'woocommerce' ),
							'type' 			=> 'select',
							'default' 		=> 'order',
							'options' 		=> array(
								'order' 	=> __( 'Per Order - charge shipping for the entire order as a whole', 'woocommerce' ),
								'item' 		=> __( 'Per Item - charge shipping for each item individually', 'woocommerce' ),
								'class' 	=> __( 'Per Class - charge shipping for each shipping class in an order', 'woocommerce' ),
							),
						),
			'additional_costs_table' => array(
						'type'				=> 'additional_costs_table'
						),
			'minimum_fee' => array(
							'title' 		=> __( 'Minimum Handling Fee', 'woocommerce' ),
							'type' 			=> 'price',
							'placeholder'	=> wc_format_localized_price( 0 ),
							'description'	=> __( 'Enter a minimum fee amount. Fee\'s less than this will be increased. Leave blank to disable.', 'woocommerce' ),
							'default'		=> '',
							'desc_tip'		=> true
						),
			);

	}


	/**
	 * calculate_shipping function.
	 *
	 * @access public
	 * @param array $package (default: array())
	 * @return void
	 */
	function calculate_shipping( $package = array() ) {

		$this->rates 		= array();
		$cost_per_order 	= ( isset( $this->cost_per_order ) && ! empty( $this->cost_per_order ) ) ? $this->cost_per_order : 0;

		if ( $this->type == 'order' ) {

			$shipping_total = $this->order_shipping( $package );

			if ( ! is_null( $shipping_total ) || $cost_per_order > 0 ) {
				$rate = array(
					'id' 	=> $this->id,
					'label' => $this->title,
					'cost' 	=> $shipping_total + $cost_per_order,
				);
			}

		} elseif ( $this->type == 'class' ) {

			$shipping_total = $this->class_shipping( $package );

			if ( ! is_null( $shipping_total ) || $cost_per_order > 0 ) {
				$rate = array(
					'id' 	=> $this->id,
					'label' => $this->title,
					'cost' 	=> $shipping_total + $cost_per_order,
				);
			}

		} elseif ( $this->type == 'item' ) {

			$costs = $this->item_shipping( $package );

			if ( ! is_null( $costs ) || $cost_per_order > 0 ) {

				if ( ! is_array( $costs ) ) {
					$costs = array();
				}

				$costs['order'] = $cost_per_order;

				$rate = array(
					'id' 		=> $this->id,
					'label' 	=> $this->title,
					'cost' 		=> $costs,
					'calc_tax' 	=> 'per_item',
				);

			}
		}

		if ( isset( $rate ) ) {
			$this->add_rate( $rate );
		}

		// Add any extra rates
		if ( sizeof( $this->options ) > 0) {

			if ( ! isset( $rate ) ) {
				$rate = array(
					'id' 	=> $this->id,
					'label' => $this->title,
					'cost' 	=> 0,
				);
			}

			// Get item qty
			$total_quantity = 0;

			foreach ( $package['contents'] as $item_id => $values ) {
				if ( $values['quantity'] > 0 && $values['data']->needs_shipping() ) {
					$total_quantity += $values['quantity'];
				}
			}

			// Loop options
			foreach ( $this->options as $option ) {

				$this_option = array_map( 'trim', explode( WC_DELIMITER, $option ) );

				if ( sizeof( $this_option ) !== 3 ) continue;

				$extra_rate = $rate;

				$extra_rate['id']    = $this->id . ':' . urldecode( sanitize_title( $this_option[0] ) );
				$extra_rate['label'] = $this_option[0];
				$this_cost           = $this_option[1];
				$this_cost_percents  = '';

				$pattern =
					'/' .           // start regex
					'(\d+\.?\d*)' . // capture digits, optionally capture a `.` and more digits
					'\s*' .         // match whitespace
					'(\+|-)' .      // capture the operand
					'\s*'.          // match whitespace
					'(\d+\.?\d*)'.  // capture digits, optionally capture a `.` and more digits
					'\%/';          // match the percent sign & end regex
				if ( preg_match( $pattern, $this_cost, $this_cost_matches ) ) {
					$this_cost_mathop = $this_cost_matches[2];
					$this_cost_percents = $this_cost_matches[3] / 100;
					$this_cost = $this_cost_matches[1];
					unset( $this_cost_matches );
				}

				// Backwards compat with yes and no
				if ( $this_option[2] == 'yes' ) {
					$this_type = 'order';
				} elseif ( $this_option[2] == 'no' ) {
					$this_type = $this->type;
				} else {
					$this_type = $this_option[2];
				}

				switch ( $this_type ) {
					case 'class' :
						$this_cost = $this_cost * sizeof( $this->find_shipping_classes( $package ) );

						// Factor $this_cost by the percentage if provided.
						if ( $this_cost_percents ) {
							foreach ( $this->find_shipping_classes( $package ) as $shipping_class => $items ){
								foreach ( $items as $item_id => $values ) {
									$this_cost = $this->calc_percentage_adjustment( $this_cost, $this_cost_percents, $this_cost_mathop, $values['line_total'] );
								}
							}
						}
					break;
					case 'item' :
						$this_cost = $this_cost * $total_quantity;

						// Factor $this_cost by the percentage if provided.
						if ( $this_cost_percents ) {
							foreach ( $package['contents'] as $item_id => $values ) {
								$this_cost = $this->calc_percentage_adjustment( $this_cost, $this_cost_percents, $this_cost_mathop, $values['line_total'] );
							}
						}
					break;
					case  'order' :
						// Factor $this_cost by the percentage if provided.
						if ( $this_cost_percents ) {
							$this_cost = $this->calc_percentage_adjustment( $this_cost, $this_cost_percents, $this_cost_mathop, $package['contents_cost'] );
						}
					break;
				}

				// Per item rates
				if ( is_array( $extra_rate['cost'] ) ) $extra_rate['cost']['order'] = $extra_rate['cost']['order'] + $this_cost;

				// Per order or class rates
				else $extra_rate['cost'] = $extra_rate['cost'] + $this_cost;

				$this->add_rate( $extra_rate );
			}
		}
	}


	/**
	 * Calculate the percentage adjustment for each shipping rate.
	 *
	 * @access public
	 * @param  float  $cost
	 * @param  float  $percent_adjustment
	 * @param  string $percent_operator
	 * @param  float  $base_price
	 * @return float
	 */
	function calc_percentage_adjustment( $cost, $percent_adjustment, $percent_operator, $base_price ) {
		if ( '+' == $percent_operator ) {
			$cost += $percent_adjustment * $base_price;
		} else {
			$cost -= $percent_adjustment * $base_price;
		}

		return $cost;
	}


	/**
	 * order_shipping function.
	 *
	 * @access public
	 * @param array $package
	 * @return float
	 */
	function order_shipping( $package ) {
		$cost 	= null;
		$fee 	= null;

		if ( sizeof( $this->flat_rates ) > 0 ) {

			$found_shipping_classes = $this->find_shipping_classes( $package );

			// Find most expensive class (if found)
			foreach ( $found_shipping_classes as $shipping_class => $products ) {
				if ( isset( $this->flat_rates[ $shipping_class ] ) ) {
					if ( $this->flat_rates[ $shipping_class ]['cost'] > $cost ) {
						$cost 	= $this->flat_rates[ $shipping_class ]['cost'];
						$fee	= $this->flat_rates[ $shipping_class ]['fee'];
					}
				} else {
					// No matching classes so use defaults
					if ( ! empty( $this->cost ) && $this->cost > $cost ) {
						$cost 	= $this->cost;
						$fee	= $this->fee;
					}
				}
			}

		}

		// Default rates if set
		if ( is_null( $cost ) && $this->cost !== '' ) {
			$cost 	= $this->cost;
			$fee 	= $this->fee;
		} elseif ( is_null( $cost ) ) {
			// Set rates to 0 if nothing is set by the user
			$cost 	= 0;
			$fee 	= 0;
		}

		// Shipping for whole order
		return $cost + $this->get_fee( $fee, $package['contents_cost'] );
	}


	/**
	 * class_shipping function.
	 *
	 * @access public
	 * @param array $package
	 * @return float
	 */
	function class_shipping( $package ) {
		$cost 	= null;
		$fee 	= null;
		$matched = false;

		if ( sizeof( $this->flat_rates ) > 0 || $this->cost !== '' ) {

			// Find shipping classes for products in the cart.
			$found_shipping_classes = $this->find_shipping_classes( $package );

			//  Store prices too, so we can calc a fee for the class.
			$found_shipping_classes_values = array();

			foreach ( $found_shipping_classes as $shipping_class => $products ) {
				if ( ! isset( $found_shipping_classes_values[ $shipping_class ] ) ) {
					$found_shipping_classes_values[ $shipping_class ] = 0;
				}

				foreach ( $products as $product ) {
					$found_shipping_classes_values[ $shipping_class ] += $product['data']->get_price() * $product['quantity'];
				}
			}

			// For each found class, add up the costs and fees
			foreach ( $found_shipping_classes_values as $shipping_class => $class_price ) {
				if ( isset( $this->flat_rates[ $shipping_class ] ) ) {
					$cost 	+= $this->flat_rates[ $shipping_class ]['cost'];
					$fee	+= $this->get_fee( $this->flat_rates[ $shipping_class ]['fee'], $class_price );
					$matched = true;
				} elseif ( $this->cost !== '' ) {
					// Class not set so we use default rate if its set
					$cost 	+= $this->cost;
					$fee	+= $this->get_fee( $this->fee, $class_price );
					$matched = true;
				}
			}
		}

		// Total
		if ( $matched ) {
			return $cost + $fee;
		} else {
			return null;
		}
	}


	/**
	 * item_shipping function.
	 *
	 * @access public
	 * @param array $package
	 * @return array
	 */
	function item_shipping( $package ) {
		// Per item shipping so we pass an array of costs (per item) instead of a single value
		$costs = array();

		$matched = false;

		// Shipping per item
		foreach ( $package['contents'] as $item_id => $values ) {
			$_product = $values['data'];

			if ( $values['quantity'] > 0 && $_product->needs_shipping() ) {
				$shipping_class = $_product->get_shipping_class();

				$fee = $cost = 0;

				if ( isset( $this->flat_rates[ $shipping_class ] ) ) {
					$cost 	= $this->flat_rates[ $shipping_class ]['cost'];
					$fee	= $this->get_fee( $this->flat_rates[ $shipping_class ]['fee'], $_product->get_price() );
					$matched = true;
				} elseif ( $this->cost !== '' ) {
					$cost 	= $this->cost;
					$fee	= $this->get_fee( $this->fee, $_product->get_price() );
					$matched = true;
				}

				$costs[ $item_id ] = ( ( $cost + $fee ) * $values['quantity'] );
			}
		}

		if ( $matched ) {
			return $costs;
		} else {
			return null;
		}
	}

	/**
	 * Finds and returns shipping classes and the products with said class.
	 *
	 * @access public
	 * @param mixed $package
	 * @return array
	 */
	public function find_shipping_classes( $package ) {
		$found_shipping_classes = array();

		// Find shipping classes for products in the cart
		if ( sizeof( $package['contents'] ) > 0 ) {
			foreach ( $package['contents'] as $item_id => $values ) {
				if ( $values['data']->needs_shipping() ) {
					$found_class = $values['data']->get_shipping_class();
					if ( ! isset( $found_shipping_classes[ $found_class ] ) ) {
						$found_shipping_classes[ $found_class ] = array();
					}

					$found_shipping_classes[ $found_class ][ $item_id ] = $values;
				}
			}
		}

		return $found_shipping_classes;
	}

	/**
	 * validate_additional_costs_field function.
	 *
	 * @access public
	 * @param mixed $key
	 * @return bool
	 */
	function validate_additional_costs_table_field( $key ) {
		return false;
	}

	/**
	 * generate_additional_costs_html function.
	 *
	 * @access public
	 * @return string
	 */
	function generate_additional_costs_table_html() {
		ob_start();
		?>
		<tr valign="top">
			<th scope="row" class="titledesc"><?php _e( 'Costs', 'woocommerce' ); ?>:</th>
			<td class="forminp" id="<?php echo $this->id; ?>_flat_rates">
				<table class="shippingrows widefat" cellspacing="0">
					<thead>
						<tr>
							<th class="check-column"><input type="checkbox"></th>
							<th class="shipping_class"><?php _e( 'Shipping Class', 'woocommerce' ); ?></th>
							<th><?php _e( 'Cost', 'woocommerce' ); ?> <a class="tips" data-tip="<?php _e( 'Cost, excluding tax.', 'woocommerce' ); ?>">[?]</a></th>
							<th><?php _e( 'Handling Fee', 'woocommerce' ); ?> <a class="tips" data-tip="<?php _e( 'Fee excluding tax. Enter an amount, e.g. 2.50, or a percentage, e.g. 5%.', 'woocommerce' ); ?>">[?]</a></th>
						</tr>
					</thead>
					<tbody class="flat_rates">
						<tr>
							<td></td>
							<td class="flat_rate_class"><?php _e( 'Any class', 'woocommerce' ); ?></td>
							<td><input type="text" value="<?php echo esc_attr( wc_format_localized_price( $this->cost ) ); ?>" name="default_cost" placeholder="<?php _e( 'N/A', 'woocommerce' ); ?>" size="4" class="wc_input_price" /></td>
							<td><input type="text" value="<?php echo esc_attr( wc_format_localized_price( $this->fee ) ); ?>" name="default_fee" placeholder="<?php _e( 'N/A', 'woocommerce' ); ?>" size="4" class="wc_input_price" /></td>
						</tr>
						<?php
						$i = -1;
						if ( $this->flat_rates ) {
							foreach ( $this->flat_rates as $class => $rate ) {
								$i++;

								echo '<tr class="flat_rate">
									<th class="check-column"><input type="checkbox" name="select" /></th>
									<td class="flat_rate_class">
											<select name="' . esc_attr( $this->id . '_class[' . $i . ']' ) . '" class="select">';

								if ( WC()->shipping->get_shipping_classes() ) {
									foreach ( WC()->shipping->get_shipping_classes() as $shipping_class ) {
										echo '<option value="' . esc_attr( $shipping_class->slug ) . '" '.selected($shipping_class->slug, $class, false).'>'.$shipping_class->name.'</option>';
									}
								} else {
									echo '<option value="">'.__( 'Select a class&hellip;', 'woocommerce' ).'</option>';
								}

								echo '</select>
							   		</td>
									<td><input type="text" value="' . esc_attr( $rate['cost'] ) . '" name="' . esc_attr( $this->id .'_cost[' . $i . ']' ) . '" placeholder="' . wc_format_localized_price( 0 ) . '" size="4" class="wc_input_price" /></td>
									<td><input type="text" value="' . esc_attr( $rate['fee'] ) . '" name="' . esc_attr( $this->id .'_fee[' . $i . ']' ) . '" placeholder="' . wc_format_localized_price( 0 ) . '" size="4" class="wc_input_price" /></td>
								</tr>';
							}
						}
						?>
					</tbody>
					<tfoot>
						<tr>
							<th colspan="4"><a href="#" class="add button"><?php _e( 'Add Cost', 'woocommerce' ); ?></a> <a href="#" class="remove button"><?php _e( 'Delete selected costs', 'woocommerce' ); ?></a></th>
						</tr>
					</tfoot>
				</table>
			   	<script type="text/javascript">
					jQuery(function() {

						jQuery('#<?php echo $this->id; ?>_flat_rates').on( 'click', 'a.add', function(){

							var size = jQuery('#<?php echo $this->id; ?>_flat_rates tbody .flat_rate').size();

							jQuery('<tr class="flat_rate">\
								<th class="check-column"><input type="checkbox" name="select" /></th>\
								<td class="flat_rate_class">\
									<select name="<?php echo $this->id; ?>_class[' + size + ']" class="select">\
						   				<?php
						   				if (WC()->shipping->get_shipping_classes()) :
											foreach (WC()->shipping->get_shipping_classes() as $class) :
												echo '<option value="' . esc_attr( $class->slug ) . '">' . esc_js( $class->name ) . '</option>';
											endforeach;
										else :
											echo '<option value="">'.__( 'Select a class&hellip;', 'woocommerce' ).'</option>';
										endif;
						   				?>\
						   			</select>\
						   		</td>\
								<td><input type="text" name="<?php echo $this->id; ?>_cost[' + size + ']" placeholder="<?php echo wc_format_localized_price( 0 ); ?>" size="4" class="wc_input_price" /></td>\
								<td><input type="text" name="<?php echo $this->id; ?>_fee[' + size + ']" placeholder="<?php echo wc_format_localized_price( 0 ); ?>" size="4" class="wc_input_price" /></td>\
							</tr>').appendTo('#<?php echo $this->id; ?>_flat_rates table tbody');

							return false;
						});

						// Remove row
						jQuery('#<?php echo $this->id; ?>_flat_rates').on( 'click', 'a.remove', function(){
							var answer = confirm("<?php _e( 'Delete the selected rates?', 'woocommerce' ); ?>");
							if (answer) {
								jQuery('#<?php echo $this->id; ?>_flat_rates table tbody tr th.check-column input:checked').each(function(i, el){
									jQuery(el).closest('tr').remove();
								});
							}
							return false;
						});

					});
				</script>
			</td>
		</tr>
		<?php
		return ob_get_clean();
	}

	/**
	 * process_flat_rates function.
	 *
	 * @access public
	 * @return void
	 */
	function process_flat_rates() {
		// Save the rates
		$flat_rate_class = array();
		$flat_rate_cost = array();
		$flat_rate_fee = array();
		$flat_rates = array();

		if ( isset( $_POST[ $this->id . '_class'] ) ) $flat_rate_class = array_map( 'wc_clean', $_POST[ $this->id . '_class'] );
		if ( isset( $_POST[ $this->id . '_cost'] ) )  $flat_rate_cost  = array_map( 'stripslashes', $_POST[ $this->id . '_cost'] );
		if ( isset( $_POST[ $this->id . '_fee'] ) )   $flat_rate_fee   = array_map( 'stripslashes', $_POST[ $this->id . '_fee'] );

		// Get max key
		$values = $flat_rate_class;
		ksort( $values );
		$value = end( $values );
		$key = key( $values );

		for ( $i = 0; $i <= $key; $i++ ) {
			if ( ! empty( $flat_rate_class[ $i ] ) && isset( $flat_rate_cost[ $i ] ) && isset( $flat_rate_fee[ $i ] ) ) {

				$flat_rate_cost[ $i ] = wc_format_decimal( $flat_rate_cost[$i] );

				if ( ! strstr( $flat_rate_fee[$i], '%' ) ) {
					$flat_rate_fee[ $i ] = wc_format_decimal( $flat_rate_fee[$i] );
				} else {
					$flat_rate_fee[ $i ] = wc_clean( $flat_rate_fee[$i] );
				}

				// Add to flat rates array
				$flat_rates[ urldecode( sanitize_title( $flat_rate_class[ $i ] ) ) ] = array(
					'cost' => $flat_rate_cost[ $i ],
					'fee'  => $flat_rate_fee[ $i ],
				);
			}
		}

		update_option( $this->flat_rate_option, $flat_rates );

		$this->get_flat_rates();
	}

	/**
	 * save_default_costs function.
	 *
	 * @access public
	 * @param array $fields
	 * @return array
	 */
	function save_default_costs( $fields ) {
	 	$default_cost = ( $_POST['default_cost'] === '' ) ? '' : wc_format_decimal( $_POST['default_cost'] );

	 	if ( ! strstr( $_POST['default_fee'], '%' ) ) {
	 		$default_fee  = ( $_POST['default_fee'] === '' ) ? '' : wc_format_decimal( $_POST['default_fee'] );
	 	} else {
	 		$default_fee = wc_clean( $_POST['default_fee'] );
	 	}

	 	$fields['cost'] = $default_cost;
	 	$fields['fee']  = $default_fee;

	 	return $fields;
	}


	/**
	 * get_flat_rates function.
	 *
	 * @access public
	 * @return void
	 */
	function get_flat_rates() {
		$this->flat_rates = array_filter( (array) get_option( $this->flat_rate_option ) );
	}

}