Php文件不会上传错误6（缺少临时文件夹）

Question

我有一个PHP网站，我正在尝试创建一个人们可以将图像上传到服务器的页面。

然而它无法正常工作，我从files变量中得到错误代码6。

我研究了这个，显然这意味着它缺少一个临时目录，但是我已经在php.ini中正确设置了临时文件夹，但它仍然无法正常工作。

以下是$ _FILES数组的内容：

Array ( [fileToUpload] => Array ( [name] => maxresdefault.jpg [type] => [tmp_name] => [error] => 6 [size] => 0 ) ) 

编辑：我在Windows 10上运行IIS作为我的服务器

编辑：这是我的代码：

<?php
ini_set('display_errors', 'On');
error_reporting(E_ALL);

$sys_vars["uploads"]++;

$target_dir = "../";
$target_file = $target_dir . $sys_vars["uploads"];
$uploadOk = 1;
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
$path_parts = pathinfo($_FILES["fileToUpload"]["name"]);
echo $_FILES["fileToUpload"]["error"];
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    if($check !== false) {
        echo "File is an image - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        $uploadOk = 0;
        //header("Location: upload.php?error=File is not an image.");
        echo "File is not an image.";
        die();
    }
}

if (file_exists($target_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}

if ($_FILES["fileToUpload"]["size"] > 500000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
    //header("Location: upload.php?error=Sorry, your file is too large.");
    die();
}

if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg") {
    echo "Sorry, only JPG, JPEG & PNG files are allowed.";
    echo $imageFileType;
    echo $_FILES["fileToUpload"]["tmp_name"];
    $uploadOk = 0;
    //header("Location: upload.php?error=Sorry, only JPG, JPEG & PNG files are allowed.");
    die();
}

if ($uploadOk == 0) {
    echo "Your file was not uploaded.";
    //header("Location: upload.php");
    die();

} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], "/")) {
        echo "The file ". basename( $_FILES["fileToUpload"]["name"]). " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
        print_r ($_FILES);
        //header("Location: upload.php?error=Sorry, there was an error uploading your file.");
        die();
    }
}
?>