Php/docs/function.posix-isatty
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posix_isatty
(PHP 4, PHP 5, PHP 7)
posix_isatty — Determine if a file descriptor is an interactive terminal
说明
posix_isatty
( mixed $fd
) : bool
Determines if the file descriptor fd
refers to a valid
terminal type device.
参数
fd
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.
In almost all cases, you will want to provide a file resource.
返回值
Returns true
if fd
is an open descriptor connected
to a terminal and false
otherwise.