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    stream_isatty

    (PHP 7 >= 7.2.0, PHP 8)

    stream_isatty — Check if a stream is a TTY

    Description

    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.

    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

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