PHP Manual: posix

function posix_ttyname(resource|int $file_descriptor): string|false

Returns a string for the absolute path to the current terminal device that is open on the file descriptor file_descriptor.

file_descriptor: The file descriptor, which is expected to be either a file resource or an int. An int will be assumed to be a file descriptor that can be passed directly to the underlying system call.

On success, returns a string of the absolute path of the file_descriptor. On failure, returns false

On invalid file_descriptor integer values an E_WARNING is raised.

Version	Description
8.5.0	`last_error` is now set to `EBADF` when an invalid `file_descriptor` is encountered.
8.3.0	Type error `E_WARNING`s are now raised for integer coercions following the usual PHP type coercion semantics.
8.3.0	On invalid `file_descriptor` integer values an `E_WARNING` is now raised.

posix_ttyname