OS Checker

<?
/*
  OS Checker :D
  By SoUiLaHxXx_Dz
*/
function OS_checker(){
  $os = $_SERVER['HTTP_USER_AGENT'];
  if(eregi("nt", $os)){
    system("dir"); // any code
  }else{
    system("clear"); // any code
  }
}
OS_checker();
?>