Php/docs/function.posix-isatty

• PHP Manual
• POSIX Functions
• Determine if a file descriptor is an interactive terminal

posix_isatty

(PHP 4, PHP 5, PHP 7)

posix_isatty — Determine if a file descriptor is an interactive terminal

Description

posix_isatty ( mixed $fd ) : bool

Determines if the file descriptor fd refers to a valid terminal type device.

Parameters

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.

Return Values

Returns TRUE if fd is an open descriptor connected to a terminal and FALSE otherwise.

See Also

• posix_ttyname() - Determine terminal device name
• stream_isatty() - Check if a stream is a TTY