Not all return types in comments seem correct in BinaryReader.php #17

Most of the functions specify return type int. While I believe the ones reading from $this->byteReader are returning string. $this->byteReader->read uses fread which returns a string (as mentioned in the comments for $this->byteReader->read).

Conversely, getUInt16 has return type string in the comments. This should probably be int.

I think some other functions have similar problems.