coding php to extract or get filename and extension

it's not hard to code but not easy to solve
easyiest way is use explode function but this is advance :)

 
  $url = "htpp://www.example.com/filename.txt
  $file = substr(strrchr($url, '/'), 1); //get file
  $ext = substr(strrchr($file, '.'), 1); //get extension
  $filename = substr($file,0,strrpos($file,'.')); // get file name

and another code is function to remove file in folder and/or empty folder

<?php
// ggarciaa at gmail dot com (04-July-2007 01:57)
// I needed to empty a directory, but keeping it
// so I slightly modified the contribution from
// stefano at takys dot it (28-Dec-2005 11:57)
// A short but powerfull recursive function
// that works also if the dirs contain hidden files
// $dir = the target directory
// $DeleteMe = if true delete also $dir, if false leave it alone
function SureRemoveDir($dir, $DeleteMe) {
  if(!$dh = @opendir($dir)) return;
  while (false !== ($obj = readdir($dh))) {
    if($obj=='.' || $obj=='..') continue;
    if (!@unlink($dir.'/'.$obj)) SureRemoveDir($dir.'/'.$obj, true);
  }
  closedir($dh);
  if($DeleteMe){
    @rmdir($dir);
  }
}
//SureRemoveDir('EmptyMe', false);
//SureRemoveDir('RemoveMe', true);
?>

link: http://th.php.net/unlink link2: