Removes a folder, including its subfolders and files in a efficient way without recursion

function removeFolder($dir)
{
if(!is_dir($dir))
return false;
for($s = DIRECTORY_SEPARATOR, $stack = array($dir), $emptyDirs = array($dir); $dir = array_pop($stack);)
{
if(!($handle = @dir($dir)))
continue;
while(false !== $item = $handle->read())
$item != '.' && $item != '..' && (is_dir($path = $handle->path . $s . $item) ?
array_push($stack, $path) && array_push($emptyDirs, $path) : unlink($path));
$handle->close();
}
for($i = count($emptyDirs); $i--; rmdir($emptyDirs[$i]));
}