renamer.php

#!/usr/bin/php
<?php
if(!isset($argv[1])) die("No prefix!\n");
define('DRY_RUN', (!isset($argv[2]) || $argv[2] !== '-r'));
define('F_PREFIX', (empty($argv[1])) ? '' : ($argv[1] . '.'));

if(DRY_RUN) echo "-- DRY RUN --\n\n";

$fi = new FilesystemIterator('./');
$ri = new RegexIterator($fi, '/(?:(?:(\d?\d)x(\d\d))|(?:s(\d\d)e(\d\d))).*?\.([a-z]{3,4})$/i', RegexIterator::GET_MATCH);

foreach($ri as $f) {
 if(empty($f[1])) {
  $s = $f[3];
  $e = $f[4];
 } else {
  $s = $f[1];
  $e = $f[2];
 }
 if($s < 10 && $s[0] !== '0') $s = "0$s";
 if($e < 10 && $e[0] !== '0') $e = "0$e";

 $nf = sprintf('%sS%sE%s.%s', F_PREFIX, $s, $e, $f[5]);
 $f = $fi->current()->getFilename();
 echo $f . "\t=>\t" . $nf . "\n";

 if(!DRY_RUN) rename($f, $nf);
}