posix_isatty()

(PHP 4, PHP 5, PHP 7)

Determine if a file descriptor is an interactive terminal

说明

Determines if the file descriptor$fdrefers to a valid terminal type device.

参数

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

If this script is like:
script.php > outfile
outfile will contain "Invalid TTY"

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