$removeChars = array(" ", "_");
                $stringLen = strlen($_FILES["file"]["name"]);
                for ($i; $i<$stringLen; ++$i) {
                    if ($_FILES["file"]["name"][$i] == " ") {
                        $_FILES["file"]["name"][$i] = str_replace($removeChars, "", $_FILES["file"]["name"][$i]);
                    }
                }