Yeah, just open the directory and create a loop to access all images and rename them, like:
<?php
if ($handle = opendir('./path/to/files')) {
while (false !== ($fileName = readdir($handle))) {
if($fileName != '.' && $fileName != '..') {
$newName = str_replace("SKU#","",$fileName);
rename('./path/to/files/'.$fileName, './path/to/files'.$newName);
}
}
closedir($handle);
}
?>
References:
http://php.net/manual/en/function.rename.php