PHP 4, PHP 5, PHP 7, PHP 8
gztell - Tell gz-file pointer read/write position
gztell( resource$stream ): int|false
Gets the position of the given file pointer; i.e., its offset into the uncompressed file stream.
The gz-file pointer. It must be valid, and must point to a file successfully opened by gzopen.
The position of the file pointer or false if an error occurs.