src/Http/Http.php
public function get($key = null, $filter = false)
    {
        if (is_null($key)) {
            return $_GET;
        }

        $value = (isset($_GET[$key]) ? $_GET[$key] : null);

        return $this->filter($value, $filter);
    }
public function get($key = null, $filter = false)
    {
        if (is_null($key)) {
            return $_GET;
        }

        $value = (isset($_GET[$key]) ? $_GET[$key] : null);

        return $this->filter($value, $filter);
    }
HTTP GET Request

@param string $key
@param bool   $filter

@return string|null