Automattic\WooCommerce\Internal\DataStores\Orders

OrdersTableStatusUnionQuery::extract_order_direction │ private │ WC 1.0

Extracts the sort direction from the ORDER BY clause, or NULL when it isn't an ORDER BY on date_created_gmt alone (the only ordering the type_status_date index can satisfy within each branch).

Method of the class: OrdersTableStatusUnionQuery{}

No Hooks.

Returns

String|null. 'ASC', 'DESC', or NULL when ineligible.

Usage

// private - for code of main (parent) class only
$result = $this->extract_order_direction( $orderby ): ?string;
$orderby(string) (required)
The ORDER BY clause, including the keyword.

OrdersTableStatusUnionQuery::extract_order_direction() code WC 11.0.0

woocommerce/src/Internal/DataStores/Orders/OrdersTableStatusUnionQuery.php 
private function extract_order_direction( string $orderby ): ?string {
	foreach ( array( 'ASC', 'DESC' ) as $direction ) {
		if ( "ORDER BY {$this->orders_table}.date_created_gmt {$direction}" === $orderby ) {
			return $direction;
		}
	}

	return null;
}