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 integer. An integer 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.

参见

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

User Contributed Notes

hfuecks at phppatterns dot com 07-May-2004 02:12


Can be useful to determine whether output is being piped elsewhere, for PHP shell scripts, for example;



#!/usr/local/bin/php

<?php

if ( !posix_isatty(STDOUT) ) {

    fwrite(STDOUT, "Invalid TTY\n");

    exit(2);

}

fwrite(STDOUT, "Enter you name\n");

$name = fgets(STDIN);

fwrite(STDOUT,"Hello $name\n");

exit(0);

?>



If this script is like:



script.php > outfile



outfile will contain "Invalid TTY"