src/View/Helper/ListFilterHelper.php
public function filterButton($title = null, array $options = [])
    {
        if (!$title) {
            $title = __d('list_filter', 'list_filter.search');
        }
        $options = Hash::merge($this->config('filterButtonOptions'), $options);

        return $this->Form->button($title, $options);
    }
public function filterButton($title = null, array $options = [])
    {
        if (!$title) {
            $title = __d('list_filter', 'list_filter.search');
        }
        $options = Hash::merge($this->config('filterButtonOptions'), $options);

        return $this->Form->button($title, $options);
    }
Outputs the search button

@param string $title button caption
@param array $options Options
@return string