Represents the criteria that will determine the entire result set of a search. The limit and offset are not included because they only determine which part of the entire result set will be returned.
|User||$actor||<p>The user performing the search.</p>|
|string||$query||<p>The search query.</p>|
|array||$sort||<p>An array of sort-order pairs, where the column is the key, and the order is the value. The order may be 'asc', 'desc', or an array of IDs to order by.</p>|