PHP Manual: Determine terminal device name

stringfalse posix_ttyname(resourceint $file_descriptor)

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
8.3.0	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