php rename behaving weird?

[QAmonet]

i have this script which i will post absolutely unmodified:\[code\]<?chdir("data");$files = glob("*");shuffle($files);var_dump($files);$i=0;$finfo = finfo_open(FILEINFO_MIME_TYPE); // return mime type ala mimetype extensionforeach($files as $file) { $i++; $k = $i; $mime = finfo_file($finfo, $file); if(strpos($mime,"gif") !== false) { $ext = "gif"; } else { $ext = "jpg"; } if($k < 10) { $k = "00".$k; } else if($k < 100) { $k = "0".$k; } $k = $k.".".$ext; rename($file,$k); echo $k."\n";}\[/code\]the folder data has some image files (jpg and gif) in it.but when i run it, suddenly a lot of images are just gone!2/3rd of the images just got deleted... i don't understand how?i have an ext3 filesystem and PHP 5.3.2