Description:
------------
I try to traversal a directory. Include about 20000 files and 200 directories.

Use scandir function, it cost about 70 seconds.

Then I use readdir function, it cost only 6 seconds!



System Version:
Linux ubuntu 2.6.20-16-generic
Apache/2.2.6
PHP/5.2.4
Mysql/5.0.45




Reproduce code:
---------------
<?php
function useScandir($dir) {
	$i = 0;
	while ($dir) {
		foreach (scandir($dir[0]) as $filename) {
			if ($filename != '.' && $filename != '..') {
				$filename = $dir[0] . '/' . $filename;
				if (is_dir($filename)) {
					echo $i . " [dir] " . $filename . "<br>";
					$dir[] = $filename;
				} else {
					echo $i . " file: " . $filename . "<br>";
				}
				$i++;
			}
		}
		array_shift($dir);
	}
}
useScandir(array ("/data/www/manual"));
?>

<?php
function useReaddir($dir) {
	$i = 0;
	while ($dir) {
		$dh = opendir($dir[0]);
		while (false !== ($filename = readdir($dh))) {
			if ($filename != '.' && $filename != '..') {
				$filename = $dir[0] . "/" . $filename;
				if (is_dir($filename)) {
					echo $i . " [dir] " . $filename . "<br>";
					$dir[] = $filename;
				} else {
					echo $i . " file: " . $filename . "<br>";
				}
				$i++;
			}
		}
		closedir($dh);
		array_shift($dir);
	}
}
useReaddir(array ('/data/www/manual'));
?>

Expected result:
----------------
run fast!!!

Actual result:
--------------
it's very slow......