Stream Functions
PHP Manual

stream_isatty

Check if a stream is a TTY

Description

bool stream_isatty(resource $stream)

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.

Parameters

stream

Return Values

Returns true on success or false on failure.

Examples

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));"

The above example will output something similar to:


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

The above example will output something similar to:


false