lib/PHPExif/Exif.php
public function getExposure()
    {
        if (!isset($this->data[self::EXPOSURE])) {
            return false;
        }

        return $this->data[self::EXPOSURE];
    }
public function getExposure()
    {
        if (!isset($this->data[self::EXPOSURE])) {
            return false;
        }

        return $this->data[self::EXPOSURE];
    }
Returns the Exposure

@return string|boolean