posix_isatty
(PHP 3 >= 3.0.13, PHP 4, PHP 5)
posix_isatty -- Determine if a file descriptor is an interactive terminal
Description
bool
posix_isatty ( int fd )
Determines if the file descriptor fd refers to a valid
terminal type device.
Return Values
Returns TRUE if fd is an open descriptor connected
to a terminal and FALSE otherwise.