posix_isatty()

(PHP 4, PHP 5, PHP 7)

Determine if a file descriptor is an interactive terminal

说明

posix_isatty(mixed $fd): bool

Determines if the file descriptor$fdrefers 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$fdis 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

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"