A shell access wrapper for windows in PHP

<?php
 
class Shell {
 
	private static $singleton;
 
	public static function singleton() {
		if (!isset(self::$singleton)) {
			$c = __CLASS__;
			self::$singleton = new $c;
		}
 
		return self::$singleton;
	}
 
	private $dir_temp;
 
	private function __construct() {
		$this->dir_temp = $this->touch_dir(dirname(__FILE__) . '/temp/');
	}
 
	public function __clone() {
		trigger_error('Clone is not allowed.', E_USER_ERROR);
	}
 
	public function temp($file = '') {
		return $this->dir_temp . $file;
	}
 
	public function out($text = '') {
		if (is_string($text)) {
			echo iconv('utf-8', 'big5', $text) . "\n";
		} else if (is_bool($text)) {
			echo ($text ? 'true' : 'false') . "\n";
		} else {
			$this->dump($text);
		}
	}
 
	public function dump($obj = false) {
		$this->out(print_r($obj, true));
	}
 
	public function nircmd($cmd) {
		$this->out("[nircmd] $cmd");
		exec("nircmd $cmd");
	}
 
	public function concmd_utf8($data, $src_encoding) {
		$path = $this->temp('concmd-' . rand(1000, 9999) . '.tmp');
		file_put_contents($path, $data);
		$cmd = "concmd /i:$src_encoding /o:UTF8 /f:T \"$path\"";
		$this->out("[concmd] $cmd");
		exec($cmd);
		$data = file_get_contents($path);
		unlink($path);
		return $data;
	}
 
	public function touch_file($path) {
		$path = str_replace('\\', '/', $path);
		touch($path);
		return $path;
	}
 
	public function touch_dir($path) {
		$path = str_replace('\\', '/', $path);
		if (!file_exists($path)) mkdir($path);
		return $path;
	}
}
 
?>