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Edit File: wc-order-item-functions.php

<?php
/**
 * WooCommerce Order Item Functions
 *
 * Functions for order specific things.
 *
 * @package WooCommerce\Functions
 * @version 3.4.0
 */

defined( 'ABSPATH' ) || exit;

/**
 * Add a item to an order (for example a line item).
 *
 * @param int   $order_id   Order ID.
 * @param array $item_array Items list.
 *
 * @throws Exception        When `WC_Data_Store::load` validation fails.
 * @return int|bool         Item ID or false
 */
function wc_add_order_item( $order_id, $item_array ) {
	$order_id = absint( $order_id );

if ( ! $order_id ) {
		return false;
	}

$defaults = array(
		'order_item_name' => '',
		'order_item_type' => 'line_item',
	);

$item_array = wp_parse_args( $item_array, $defaults );
	$data_store = WC_Data_Store::load( 'order-item' );
	$item_id    = $data_store->add_order_item( $order_id, $item_array );
	$item       = WC_Order_Factory::get_order_item( $item_id );

do_action( 'woocommerce_new_order_item', $item_id, $item, $order_id );

return $item_id;
}

/**
 * Update an item for an order.
 *
 * @since 2.2
 * @param int   $item_id Item ID.
 * @param array $args    Either `order_item_type` or `order_item_name`.
 *
 * @throws Exception     When `WC_Data_Store::load` validation fails.
 * @return bool          True if successfully updated, false otherwise.
 */
function wc_update_order_item( $item_id, $args ) {
	$data_store = WC_Data_Store::load( 'order-item' );
	$update     = $data_store->update_order_item( $item_id, $args );

if ( false === $update ) {
		return false;
	}

do_action( 'woocommerce_update_order_item', $item_id, $args );

return true;
}

/**
 * Delete an item from the order it belongs to based on item id.
 *
 * @param int $item_id  Item ID.
 *
 * @throws Exception    When `WC_Data_Store::load` validation fails.
 * @return bool
 */
function wc_delete_order_item( $item_id ) {
	$item_id = absint( $item_id );

if ( ! $item_id ) {
		return false;
	}

$data_store = WC_Data_Store::load( 'order-item' );

do_action( 'woocommerce_before_delete_order_item', $item_id );

$data_store->delete_order_item( $item_id );

do_action( 'woocommerce_delete_order_item', $item_id );

return true;
}

/**
 * WooCommerce Order Item Meta API - Update term meta.
 *
 * @param int    $item_id    Item ID.
 * @param string $meta_key   Meta key.
 * @param mixed  $meta_value Meta value.
 * @param string $prev_value Previous value (default: '').
 *
 * @throws Exception         When `WC_Data_Store::load` validation fails.
 * @return bool
 */
function wc_update_order_item_meta( $item_id, $meta_key, $meta_value, $prev_value = '' ) {
	$data_store = WC_Data_Store::load( 'order-item' );
	if ( $data_store->update_metadata( $item_id, $meta_key, $meta_value, $prev_value ) ) {
		WC_Cache_Helper::invalidate_cache_group( 'object_' . $item_id ); // Invalidate cache.
		return true;
	}
	return false;
}

/**
 * WooCommerce Order Item Meta API - Add term meta.
 *
 * @param int    $item_id    Item ID.
 * @param string $meta_key   Meta key.
 * @param mixed  $meta_value Meta value.
 * @param bool   $unique     If meta data should be unique (default: false).
 *
 * @throws Exception         When `WC_Data_Store::load` validation fails.
 * @return int               New row ID or 0.
 */
function wc_add_order_item_meta( $item_id, $meta_key, $meta_value, $unique = false ) {
	$data_store = WC_Data_Store::load( 'order-item' );
	$meta_id    = $data_store->add_metadata( $item_id, $meta_key, $meta_value, $unique );

if ( $meta_id ) {
		WC_Cache_Helper::invalidate_cache_group( 'object_' . $item_id ); // Invalidate cache.
		return $meta_id;
	}
	return 0;
}

/**
 * WooCommerce Order Item Meta API - Delete term meta.
 *
 * @param int    $item_id    Item ID.
 * @param string $meta_key   Meta key.
 * @param mixed  $meta_value Meta value (default: '').
 * @param bool   $delete_all Delete all meta data, defaults to `false`.
 *
 * @throws Exception         When `WC_Data_Store::load` validation fails.
 * @return bool
 */
function wc_delete_order_item_meta( $item_id, $meta_key, $meta_value = '', $delete_all = false ) {
	$data_store = WC_Data_Store::load( 'order-item' );
	if ( $data_store->delete_metadata( $item_id, $meta_key, $meta_value, $delete_all ) ) {
		WC_Cache_Helper::invalidate_cache_group( 'object_' . $item_id ); // Invalidate cache.
		return true;
	}
	return false;
}

/**
 * WooCommerce Order Item Meta API - Get term meta.
 *
 * @param int    $item_id Item ID.
 * @param string $key     Meta key.
 * @param bool   $single  Whether to return a single value. (default: true).
 *
 * @throws Exception      When `WC_Data_Store::load` validation fails.
 * @return mixed
 */
function wc_get_order_item_meta( $item_id, $key, $single = true ) {
	$data_store = WC_Data_Store::load( 'order-item' );
	return $data_store->get_metadata( $item_id, $key, $single );
}

/**
 * Get order ID by order item ID.
 *
 * @param  int $item_id Item ID.
 *
 * @throws Exception    When `WC_Data_Store::load` validation fails.
 * @return int
 */
function wc_get_order_id_by_order_item_id( $item_id ) {
	$data_store = WC_Data_Store::load( 'order-item' );
	return $data_store->get_order_id_by_order_item_id( $item_id );
}

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