Delete file

function deldir($dir) {
  $dh=opendir($dir);
  while ($file=readdir($dh)) {
    if($file!="." && $file!="..") {
      $fullpath=$dir."/".$file;
      if(!is_dir($fullpath)) {
		  if($file != "abc.csv") {
			unlink($fullpath);
		  }
      } else {
        deldir($fullpath);
      }
    }
  }
 
  closedir($dh);
 
}