PHP move_uploaded_file（）不工作但也没有错误

Question

当它突然停止时，它完全正常。我不记得在剧本的这一部分改变了什么，所以它非常奇怪。

$target_dir = "./files/tickets/" . $_SESSION['username'] . "/" . $ticketNumber['ticket_number'];

foreach ($_FILES['ticketFiles']['error'] as $key => $error) {
    if ($error == UPLOAD_ERR_OK) {
        $tmp_name = $_FILES['ticketFiles']['tmp_name'][$key];
        $name = basename($_FILES['ticketFiles']['name'][$key]);

        if (!is_dir($target_dir)) {
            mkdir($target_dir, 0777, true);
        }

        if (move_uploaded_file($tmp_name, "$target_dir/$name")) {
            //move_uploaded_file($tmp_name, "$target_dir/$name");
            $_SESSION['message'] .= "File " . $name . " have been successfully uploaded.<br>";
        } else {
            $_SESSION['message'] .= "There was an error uploading file " . $name . ". Try again please.";
            $uploadOk = 0;
        }
    }
}

目录已创建但未显示任何文件。 ＆＃34;成功上传＆＃34;消息也会显示。