(PHP 7 >= 7.2.0)
stream_isatty — Check if a stream is a TTY
$stream
) : bool
Determines if stream stream refers to a valid terminal type device.
This is a more portable version of posix_isatty(), since it works on Windows systems too.
stream
成功时返回 TRUE， 或者在失败时返回 FALSE。
Example #1 stream_isatty() example
This command can be used to determine if a standard output / standard error stream is redirected to a file.
php -r "var_export(stream_isatty(STDERR));"
以上例程的输出类似于：
php -r "var_export(stream_isatty(STDERR));" 2>output.txt
以上例程的输出类似于：