function wc_save_order_items( $order_id, $items ) {
	// Allow other plugins to check change in order items before they are saved.
	do_action( 'woocommerce_before_save_order_items', $order_id, $items );

	$qty_change_order_notes = array();

	// Line items and fees.
	if ( isset( $items['order_item_id'] ) ) {
		$data_keys = array(
			'line_tax'             => array(),
			'line_subtotal_tax'    => array(),
			'order_item_name'      => null,
			'order_item_qty'       => null,
			'order_item_tax_class' => null,
			'line_total'           => null,
			'line_subtotal'        => null,
		);
		foreach ( $items['order_item_id'] as $item_id ) {
			$item = WC_Order_Factory::get_order_item( absint( $item_id ) );

			if ( ! $item ) {
				continue;
			}

			$item_data = array();

			foreach ( $data_keys as $key => $default ) {
				$item_data[ $key ] = isset( $items[ $key ][ $item_id ] ) ? wc_check_invalid_utf8( wp_unslash( $items[ $key ][ $item_id ] ) ) : $default;
			}

			if ( '0' === $item_data['order_item_qty'] ) {
				$changed_stock = wc_maybe_adjust_line_item_product_stock( $item, 0 );
				if ( $changed_stock && ! is_wp_error( $changed_stock ) ) {
					$qty_change_order_notes[] = $item->get_name() . ' – ' . $changed_stock['from'] . '→' . $changed_stock['to'];
				}
				$item->delete();
				continue;
			}

			$item->set_props(
				array(
					'name'      => $item_data['order_item_name'],
					'quantity'  => $item_data['order_item_qty'],
					'tax_class' => $item_data['order_item_tax_class'],
					'total'     => $item_data['line_total'],
					'subtotal'  => $item_data['line_subtotal'],
					'taxes'     => array(
						'total'    => $item_data['line_tax'],
						'subtotal' => $item_data['line_subtotal_tax'],
					),
				)
			);

			if ( 'fee' === $item->get_type() ) {
				$item->set_amount( $item_data['line_total'] );
			}

			if ( isset( $items['meta_key'][ $item_id ], $items['meta_value'][ $item_id ] ) ) {
				foreach ( $items['meta_key'][ $item_id ] as $meta_id => $meta_key ) {
					$meta_key   = substr( wp_unslash( $meta_key ), 0, 255 );
					$meta_value = isset( $items['meta_value'][ $item_id ][ $meta_id ] ) ? wp_unslash( $items['meta_value'][ $item_id ][ $meta_id ] ) : '';

					if ( '' === $meta_key && '' === $meta_value ) {
						if ( ! strstr( $meta_id, 'new-' ) ) {
							$item->delete_meta_data_by_mid( $meta_id );
						}
					} elseif ( strstr( $meta_id, 'new-' ) ) {
						$item->add_meta_data( $meta_key, $meta_value, false );
					} else {
						$item->update_meta_data( $meta_key, $meta_value, $meta_id );
					}
				}
			}

			// Allow other plugins to change item object before it is saved.
			do_action( 'woocommerce_before_save_order_item', $item );

			$item->save();

			$changed_stock = wc_maybe_adjust_line_item_product_stock( $item );
			if ( $changed_stock && ! is_wp_error( $changed_stock ) ) {
				$qty_change_order_notes[] = $item->get_name() . ' (' . $changed_stock['from'] . '→' . $changed_stock['to'] . ')';
			}
		}
	}

	// Shipping Rows.
	if ( isset( $items['shipping_method_id'] ) ) {
		$data_keys = array(
			'shipping_method'       => null,
			'shipping_method_title' => null,
			'shipping_cost'         => 0,
			'shipping_taxes'        => array(),
		);

		foreach ( $items['shipping_method_id'] as $item_id ) {
			$item = WC_Order_Factory::get_order_item( absint( $item_id ) );

			if ( ! $item ) {
				continue;
			}

			$item_data = array();

			foreach ( $data_keys as $key => $default ) {
				$item_data[ $key ] = isset( $items[ $key ][ $item_id ] ) ? wc_clean( wp_unslash( $items[ $key ][ $item_id ] ) ) : $default;
			}

			$item->set_props(
				array(
					'method_id'    => $item_data['shipping_method'],
					'method_title' => $item_data['shipping_method_title'],
					'total'        => $item_data['shipping_cost'],
					'taxes'        => array(
						'total' => $item_data['shipping_taxes'],
					),
				)
			);

			if ( isset( $items['meta_key'][ $item_id ], $items['meta_value'][ $item_id ] ) ) {
				foreach ( $items['meta_key'][ $item_id ] as $meta_id => $meta_key ) {
					$meta_value = isset( $items['meta_value'][ $item_id ][ $meta_id ] ) ? wp_unslash( $items['meta_value'][ $item_id ][ $meta_id ] ) : '';

					if ( '' === $meta_key && '' === $meta_value ) {
						if ( ! strstr( $meta_id, 'new-' ) ) {
							$item->delete_meta_data_by_mid( $meta_id );
						}
					} elseif ( strstr( $meta_id, 'new-' ) ) {
						$item->add_meta_data( $meta_key, $meta_value, false );
					} else {
						$item->update_meta_data( $meta_key, $meta_value, $meta_id );
					}
				}
			}

			$item->save();
		}
	}

	$order = wc_get_order( $order_id );

	if ( ! empty( $qty_change_order_notes ) ) {
		/* translators: %s item name. */
		$order->add_order_note( sprintf( __( 'Adjusted stock: %s', 'woocommerce' ), implode( ', ', $qty_change_order_notes ) ), false, true );
	}

	$order->update_taxes();
	$order->calculate_totals( false );

	// Inform other plugins that the items have been saved.
	do_action( 'woocommerce_saved_order_items', $order_id, $items );
}