juzna@juzna-pc:/tmp/php-test$ cat > rename.php
<?php
error_reporting(E_ALL);
var_dump(rename('..', '..'));
juzna@juzna-pc:/tmp/php-test$ php rename.php
bool(true)
juzna@juzna-pc:/tmp/php-test$ php -v
PHP 5.4.0 (cli) (built: Mar 11 2012 19:23:58)
Copyright (c) 1997-2012 The PHP Group
Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies
    with Xdebug v2.2.0rc1, Copyright (c) 2002-2012, by Derick Rethans
juzna@juzna-pc:/tmp/php-test$ uname -a
Linux juzna-pc 2.6.32-34-generic #77-Ubuntu SMP Tue Sep 13 19:39:17 UTC 2011 x86_64 GNU/Linux
juzna@juzna-pc:/tmp/php-test$ mount
/dev/sda1 on / type ext4 (rw,noatime,errors=remount-ro,user_xattr,discard)
none on /tmp type tmpfs (rw,nosuid,nodev,noatime,size=1000M,mode=1777)
...