string posix_ttyname(mixed $fd)
Returns a string for the absolute path to the current terminal device that is open on the file descriptor
On success, returns a string of the absolute path of the
fd. On failure, returns
- mixed $fd: The file descriptor, which is expected to be either a file resource or an integer. An integer will be assumed to be a file descriptor that can be passed directly to the underlying system call.
In almost all cases, you will want to provide a file resource.