public function getLastGroupPrefix()
    {
        if (! empty($this->groupStack)) {
            $last = end($this->groupStack);

            return isset($last['prefix']) ? $last['prefix'] : '';
        }

        return '';
    }
public function getLastGroupPrefix()
    {
        if (! empty($this->groupStack)) {
            $last = end($this->groupStack);

            return isset($last['prefix']) ? $last['prefix'] : '';
        }

        return '';
    }
public function getLastGroupPrefix ( ) { if ( ! empty ( $ this -> groupStack ) ) { $ last = end ( $ this -> groupStack ) ; return isset ( $ last [ 'prefix' ] ) ? $ last [ 'prefix' ] : '' ; } return '' ; }
Get the prefix from the last group on the stack.

@return string
Get the prefix from the last group on the stack .