posix_isatty

(PHP 4, PHP 5, PHP 7, PHP 8)

posix_isatty — Determine if a file descriptor is an interactive terminal

Description

posix_isatty(resource|int $file_descriptor): bool

Determines if the file descriptor file_descriptor 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 file_descriptor is an open descriptor connected to a terminal and false otherwise.

See Also