lib/PHPExif/Exif.php
public function getMimeType()
    {
        if (!isset($this->data[self::MIMETYPE])) {
            return false;
        }
        
        return $this->data[self::MIMETYPE];
    }
public function getMimeType()
    {
        if (!isset($this->data[self::MIMETYPE])) {
            return false;
        }
        
        return $this->data[self::MIMETYPE];
    }
Returns the mimetype, if it exists

@return string|boolean