/**
*
* Returns a Binary string representing the PBI file.
* @param $showtimeId
* @return null|string binary string
*/
public function getRawQrCode($showtimeId)
{
$cached = $this->checkCache($showtimeId);
if ($cached) {
return file_get_contents($cached);
}
$filename = $this->getPNGQrCode($showtimeId);
if ($filename) {
$converter = new \ImageConverter($filename);
$cacheFile = $this->cacheName($showtimeId);
if ($converter->convertToPbi($cacheFile)) {
return file_get_contents($cacheFile);
}
}
return null;
}