stream_isatty

(PHP 7 >= 7.2.0)

stream_isatty — Check if a stream is a TTY

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stream_isatty ( resource $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.

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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));"

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true
php -r "var_export(stream_isatty(STDERR));" 2>output.txt

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false