Grido\Components\Filters\Filter::__getCondition PHP Method

    public function __getCondition($value)
    {
        if ($value === '' || $value === NULL) {
            return FALSE;
            //skip
        }
        $condition = $this->getCondition();
        if ($this->where !== NULL) {
            $condition = Condition::setupFromCallback($this->where, $value);
        } elseif (is_string($condition)) {
            $condition = Condition::setup($this->getColumn(), $condition, $this->formatValue($value));
        } elseif (is_callable($condition)) {
            $condition = call_user_func_array($condition, [$value]);
        } elseif (is_array($condition)) {
            $condition = isset($condition[$value]) ? $condition[$value] : Condition::setupEmpty();
        }
        if (is_array($condition)) {
            //for user-defined condition by array or callback
            $condition = Condition::setupFromArray($condition);
        } elseif ($condition !== NULL && !$condition instanceof Condition) {
            $type = gettype($condition);
            throw new Exception("Condition must be array or Condition object. {$type} given.");
        }
        return $condition;
    }