(PHP 4, PHP 5, PHP 7)
gztell — Tell gz-file pointer read/write position
$zp
) : intGets the position of the given file pointer; i.e., its offset into the uncompressed file stream.
zpThe 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.