static function decodeVersionInformation($versionBits)
{
$bestDifference = PHP_INT_MAX;
$bestVersion = 0;
for ($i = 0; $i < count(self::$VERSION_DECODE_INFO); $i++) {
$targetVersion = self::$VERSION_DECODE_INFO[$i];
// Do the version info bits match exactly? done.
if ($targetVersion == $versionBits) {
return self::getVersionForNumber($i + 7);
}
// Otherwise see if this is the closest to a real version info bit string
// we have seen so far
$bitsDifference = FormatInformation::numBitsDiffering($versionBits, $targetVersion);
if ($bitsDifference < $bestDifference) {
$bestVersion = $i + 7;
$bestDifference = $bitsDifference;
}
}
// We can tolerate up to 3 bits of error since no two version info codewords will
// differ in less than 8 bits.
if ($bestDifference <= 3) {
return self::getVersionForNumber($bestVersion);
}
// If we didn't find a close enough match, fail
return null;
}
