图片命令

        $key = date('Y')."/".date('m')."/".date('d').'/'.substr(md5($file), 0, 5) . date('YmdHis') . rand(0, 9999) . '.' . $ext;

$key = "2020/08/05/0bfd0202008052252373349.jpg";

$file = $_FILES['file']['tmp_name'];

$pathinfo = pathinfo($_FILES['file']['name']);

$ext = $pathinfo['extension'];