you can rename all files in upload folder with this code
<?php
$directory = ”;
if ($handle = opendir($directory)) {
while (false !== ($fileName = readdir($handle))) {
// explode extension and name
$filepart = explode(‘.’, $fileName);
// you could replace special characters using this
//$newname = str_replace(‘_’,’-‘,$filepart[0]);
// or using preg replace you can remove all unwanted characters from filename
// preg_replace(‘/[^a-zA-Z0-9-_.]/’)
$newfile = strtolower($newname.’.’.$filepart[1]);
rename($directory . $fileName, $directory.$newfile);
}
closedir($handle);
}
?>
