Query::validate_filters PHP Метод

    function validate_filters()
    {
        foreach ($this->filters as $field => $values) {
            # filter requires one or more values
            # filter doesn't require any value
            $value = $this->values_for($field);
            if (!(!is_null($value) && !empty($value[0]) || in_array($this->operator_for($field), array("o", "c", "!*", "*", "t", "w")))) {
                $this->invalidate($this->label_for($field), 'Please be sure to input.');
            }
        }
        return true;
    }