(PHP 4, PHP 5, PHP 7, PHP 8)
posix_isatty — Determine if a file descriptor is an interactive terminal
$file_descriptor): bool
Determines if the file descriptor file_descriptor refers to a valid
terminal type device.
fdThe 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.
In almost all cases, you will want to provide a file resource.
Returns true if file_descriptor is an open descriptor connected
to a terminal and false otherwise.