由move_uploaded_file（）引起的权限问题的解决方法

Question

I'm currently uploading images to my webserver using below PHP script. However, this causes permission troubles which I can not seem to change due to restrictions of webserver access. What's the best way to work around these permission warnings?

<?php
function upload_image()
{
    $target_dir = "../images/uploads/";
    $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
    $uploadOk = true;
    $imageFileType = pathinfo($target_file, PATHINFO_EXTENSION);
// Check if image file is a actual image or fake image
    if (isset($_POST["submit"])) {
        $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
        if ($check !== false) {
            $uploadOk = true;
        } else {
            $uploadOk = false;
            return "Sorry, file is not an image.";
        }
    }
// Check if file already exists
    if (file_exists($target_file)) {
        $uploadOk = false;
        return "Sorry, file already exists.";
    }
// Check file size
    if ($_FILES["fileToUpload"]["size"] > 200000000) {
        $uploadOk = false;
        return "Sorry, your file is too large.";
    }
// Allow certain file formats
    if ($imageFileType != "JPG" && $imageFileType != "PNG" && $imageFileType != "JPEG"
        && $imageFileType != "GIF"
    ) {
        $uploadOk = false;
        return "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    }
// Check if $uploadOk is set to 0 by an error
    if ($uploadOk == false) {
        return "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
    } else {
        if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
            return basename($_FILES["fileToUpload"]["name"]);
        } else {
            return "Sorry, there was an error uploading your file.";
        }
    }
}