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  • posix_isatty()

    (PHP 4, PHP 5, PHP 7)

    Determine if a file descriptor is an interactive terminal

    说明

    posix_isatty(mixed $fd): bool

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

    参数

    $fd

    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

    Can be useful to determine whether output is being piped elsewhere, for PHP shell scripts, for example;
    #!/usr/local/bin/php
    <?php
    if ( !posix_isatty(STDOUT) ) {
      fwrite(STDOUT, "Invalid TTY\n");
      exit(2);
    }
    fwrite(STDOUT, "Enter you name\n");
    $name = fgets(STDIN);
    fwrite(STDOUT,"Hello $name\n");
    exit(0);
    ?>
    If this script is like:
    script.php > outfile
    outfile will contain "Invalid TTY"

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