recursively change file extensions

changeext.php

/* taken from this comment on PHP.net - http://php.net/manual/en/function.rename.php#88081 */

//changes files in $directory with extension $ext1 to have extension $ext2
//note that if file.ext2 already exists it will simply be over-written
function changeext($directory, $ext1, $ext2, $verbose = false, $testing=true) {
  if ($verbose && $testing) { echo "Testing only . . . <br />";}
  $num = 0;
  if($curdir = opendir($directory)) {
   if ($verbose) echo "Opening $directory . . .<br />";
   while($file = readdir($curdir)) {
     if($file != '.' && $file != '..') {

       $srcfile = $directory . '/' . $file;
       $string  = "$file";
       $str     = strlen($ext1);
       $str++;
       $newfile = substr($string, 0, -$str);
       $newfile = $newfile.'.'.$ext2;
       $dstfile = $directory . '/' . $newfile;

       if (eregi("\.$ext1". '$' ,$file)) { # Look at only files with a pre-defined extension, '$' ensures the ext is only at they end of the filename

         //I think the next two lines are unnecessary but they 
         //don't hurt anything so I'm leaving them
         $fileHand = fopen($srcfile, 'r');
         fclose($fileHand);

         if (!$testing) {
            $result=rename($srcfile, $dstfile );
            if (!$result) echo "ERROR renaming $srcfile -> $dstfile<br />";
         }
       

         if ($verbose) echo "$srcfile -> $dstfile<br />";
       }

       if(is_dir($srcfile)) {
         $num += changeext($srcfile, $ext1, $ext2, $verbose, $testing);
       }
     }
   }
   closedir($curdir);
  }
  return $num;
}

$testing=true;
$verbose=true;

//example usages, first run with $testing set to false, then change $testing to true to do them for real:
//changeext('your/directory', 'php', 'html', $verbose,  $testing);
//changeext('your/directory', 'html', 'php',  $verbose, $testing);

Plan:

• make recursive optional
• only change extension if filename matches a regex pattern