IOMode Class PHP STDIN && STDOUT && STDERR

iomode.php

<?php
class IOMode
{
    public $stdin;
    public $stdout;
    public $stderr;

    private function getMode(&$dev, $fp)
    {
        $stat = fstat($fp);
        $mode = $stat['mode'] & 0170000; // S_IFMT

        $dev = new StdClass;

        $dev->isFifo = $mode == 0010000; // S_IFIFO
        $dev->isChr  = $mode == 0020000; // S_IFCHR
        $dev->isDir  = $mode == 0040000; // S_IFDIR
        $dev->isBlk  = $mode == 0060000; // S_IFBLK
        $dev->isReg  = $mode == 0100000; // S_IFREG
        $dev->isLnk  = $mode == 0120000; // S_IFLNK
        $dev->isSock = $mode == 0140000; // S_IFSOCK
    }

    public function __construct()
    {
        $this->getMode($this->stdin,  STDIN);
        $this->getMode($this->stdout, STDOUT);
        $this->getMode($this->stderr, STDERR);
    }
}

$io = new IOMode;

Example usage

Input:

$ php io.php
// Character device as input
// $io->stdin->isChr  == true

$ echo | php io.php
// Input piped from another command
// $io->stdin->isFifo == true

$ php io.php < infile
// Input from a regular file (name taken verbatim from C headers)
// $io->stdin->isReg  == true

$ mkdir test
$ php io.php < test
// Directory used as input
// $io->stdin->isDir  == true

Output:

$ php io.php
// $io->stdout->isChr  == true

$ php io.php | cat
// $io->stdout->isFifo == true

$ php io.php > outfile
// $io->stdout->isReg  == true

Error:

$ php io.php
// $io->stderr->isChr  == true

$ php io.php 2>&1 | cat
// stderr redirected to stdout AND piped to another command
// $io->stderr->isFifo == true

$ php io.php 2>error
// $io->stderr->isReg  == true