/**
* Setter for the ignoredSearchWordsCallback function
*
* @param callable $function Function name or actual function.
*
* @return callable The previous function.
*
* @since 1.7.0
*/
public function setIgnoredSearchWordsCallback(callable $function)
{
$previous = $this->ignoredSearchWordsCallback;
$this->ignoredSearchWordsCallback = $function;
return $previous;
}