<?php
// delete all files from new/new/uploads/newfiles first

ini_set('display_errors',1); // enable php error display for easy trouble shooting
error_reporting(E_ALL); // set error display to all

$imagepath = 'new/new/uploads';
$newfilepath = $imagepath . '/newfiles';
if (file_exists($newfilepath) === false) {
    mkdir($path, 0777, true);
}
$log = $newfilepath . "/log.txt";
$images = GLOB($imagepath . "/" . "*{.jpg,.jpeg,.png,.gif}", GLOB_BRACE);
foreach ($images as $img) {
    $oldfilename = basename($img);
    $newfilename = preg_replace("/[\s_]/", "-", $oldfilename); // replace space with dash
    if (rename($img, $newfilepath . '/' . $newfilename)) {
        $data = "original file: {$img} to: {$newfilename} status: Successful\r\n";
    } else {
        $data = "original file: {$img} to: {$newfilename} status: Fail\r\n";
    }
    file_put_contents($log, $data, FILE_APPEND); // create log file
}