delete directory recursive in php on linux

I want to delete recursively directories in php on linux
The code I am using is this:
$dir = $_SERVER['DOCUMENT_ROOT']."temp/";
function deldir($dir)
{
  $dh=opendir($dir);
  if (!$dh)
  {
     echo "could not open dir";
  }
  while ($file=readdir($dh))
  {
    if($file!="." && $file!="..")
    {
        $fullpath=$dir."/".$file;
        if(!is_dir($fullpath))
        {
            unlink($fullpath);
         }
         else
        {
           deldir($fullpath);
        }
    }
  }
 closedir($dh);       
  if(rmdir($dir))
   {
     return true;
    }
   else
    {
      return false;
    }
}
But this is not working for me. The Code returns "could not open dir".
BorsecAsked:
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shobinsunCommented:
shobinsunCommented:
Did you check that the directory has suitable permission?
shobinsunCommented:
The directory must have relevant permisions.

Please check that.
BorsecAuthor Commented:
I found my problem and is working
$dir = $_SERVER['DOCUMENT_ROOT']."temp/";
function deldir($dir)
{
  $dh=opendir($dir);
  if (!$dh)
  {
     echo "could not open dir";
  }
  while ($file=readdir($dh))
  {
    if($file!="." && $file!="..")
    {
        $fullpath=$dir."/".$file;
        if(!is_dir($fullpath))
        {
            unlink($fullpath);
         }
         else
        {
           $this->deldir($fullpath);//here was my problem
        }
    }
  }
 closedir($dh);        
  if(rmdir($dir))
   {
     return true;
    }
   else
    {
      return false;
    }
}
Thank you all for your time

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