php creates the of sample code for a folder named UNIX timestamp

<?php   
  //Get   timenow   

  $addtime=date("Ymd",time());   

  //Creat   Dir   
  $testdir="./".$addtime."/";   
  if(file_exists($testdir)):   
  else:   
  mkdir($testdir,0777);   
  endif;   
  ?>