/**
 * 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;
}