StreamNotReadableException example

private function isGifAnimated(string $filename): bool
    {
        if (!($fh = @fopen($filename, 'rb'))) {
            return false;
        }
        $count = 0;

        while (!feof($fh) && $count < 2) {
            $chunk = fread($fh, 1024 * 100); // read 100kb at a time             if ($chunk === false) {
                if (!Feature::isActive('v6.6.0.0')) {
                    throw new StreamNotReadableException('Animated gif file not readable');
                }

                throw MediaException::cannotOpenSourceStreamToRead($filename);
            }
            $count += preg_match_all('#\x00\x21\xF9\x04.{4}\x00(\x2C|\x21)#s', $chunk, $matches);
        }

        fclose($fh);

        return $count > 1;
    }