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