Rename all files in directory with php

A quick way to rename files in a directory using php. Copied from http://phpweby.com/downloads/filerenamer

/****************************************************************************
* DO NOT REMOVE *

Project: PHPWeby file renamer version 1.0
Url: http://phpweby.com/
Copyright: (C) 2008 Blagoj Janevski – bl@blagoj.com
Project Manager: Blagoj Janevski

More info, sample code and code implementation can be found here:

http://phpweby.com/software/filerenamer

For help, feature requests, comments, feedback, discussion … please join our
Webmaster forums – http://forums.phpweby.com

Visit http://phpweby.com for the latest PHP tutorials, articles, etc.

///PLEASE BACKUP YOUR FILES BEFORE EXECUTING THIS SCRIPT///

*****************************************************************************
*  If you like this software please link to us!                             *
*  Use this code:                                                            *
*  <a href="http://phpweby.com/software/filerenamer">PHP file renamer</a>   *
*****************************************************************************

License:
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

*********************************************************/

///PLEASE BACKUP YOUR FILES BEFORE EXECUTING THIS SCRIPT///

// the directory
// './' – is the current directory
// '../' – is the parent directory
// case sensitive
// e.x.: /home/user or c:\files
$dir='./';

// 1 – uppercase all files
// 2 – lowercase all files
// 3 – do not uppercase or lowercase
$up=3;

//rename files that have $w in their filename
//case sensitive
//set to " if you want to rename all files
$w='.jpg';

//do not rename files having $n in their filename
$n=";

//add prefix to files
$prefix=";

//add postfix
$postfix=";

//replace
$replace=";
$replace_with=";

//true – traverse subdirectories
//false – do not traverse subdirectories
$tr=false;

////// do NOT change anything below this /////////
set_time_limit(120);
$files=array();
error_reporting(E_ERROR | E_PARSE);
function prep($f,$dir)
{
global $up,$prefix,$postfix,$w,$replace_with,$replace,$n,$files;
if(strpos($f,$n)!==false)
return $f;
$f=str_replace($replace,$replace_with,$f);
if($up==1)
$f=strtoupper($f);
elseif($up==2)
$f=strtolower($f);
$f=$prefix.$f.$postfix;
$files[]=$dir.$f;
return $f;
}
$i=0;
function dir_tr($dir)
{
global $i,$w,$tr,$files;
$dir=rtrim(trim($dir,'\\'),'/') . '/';
$d=@opendir($dir);
if(!$d)die('The directory ' .$dir .' does not exists or PHP have no access to it<br><a target="_blank" href="http://forums.phpweby.com">Need help?</a>');

while(false!==($file=@readdir($d)))
{
if ($file!='.' && $file!='..' && $file!='renamer.php')
{
if(is_file($dir.$file))
{
if($w==" || (strpos($file,$w)!==false))
{
if(!in_array($dir.$file,$files))
{
rename($dir.$file,$dir.(prep($file,$dir)));
$i++;
}
}
}
else
{
if(is_dir($dir.$file))
{
if($tr)
dir_tr($dir.$file);
}
}
}
}
@closedir($d);
}
dir_tr($dir);
echo '<br>Renamed ' . $i . ' files in directory<br>' . $dir;
echo "<br>You can now delete renamer.php";
echo '<br><br>If you like this software please link to us!<br>Use this code:<br>
'. htmlspecialchars('<a href="http://phpweby.com/software/filerenamer">PHP file renamer</a>') .'<br>
More info and links can be found at <a href="http://phpweby.com/link" target="_blank">http://phpweby.com/link</a><br> ' ;
echo 'For help, comments, feedback, discussion … please join our
<a href="http://forums.phpweby.com" target="_blank" style="color:blue;font-weight:bold;">Webmaster Forums</a>';