为什么没有使用php表单将图像文件上传到特定文件夹

问：

这是我的代码，它选择图像文件并上传到指定的文件夹上。但是我在程序中遇到了问题。所选文件不会上传到分配给的“fillll”文件夹，而是上传到“Pictues”文件夹。 如何纠正此行为？$target_dir

<?php

if($_SERVER["REQUEST_METHOD"]==="POST"){

    if (isset($_FILES['fileToUpload']) && !empty($_FILES['fileToUpload']['name'])) {
        $target_dir = 'C:/Users/HP-PC/Pictures/filll';
        $target_file = $target_dir . basename($_FILES['fileToUpload']['name']);
        $uploadOk = 1;
        $imageFileType = strtolower(pathinfo($target_file, PATHINFO_EXTENSION));
        $fileError="";
        $succsess="";

        $check = getimagesize($_FILES['fileToUpload']['tmp_name']);
            if ($check !== false) {
                $success = "File is an image - " . $check['mime'] . ".<br>";
                $uploadOk = 1;
            } else {
                $fileError .= "File is not an image.<br>";
                $uploadOk = 0;
            }

            if (file_exists($target_file)) {
                $fileError .= "Sorry, file already exists.<br>";
                $uploadOk = 0;
            }


            if ($_FILES["fileToUpload"]["size"] > 500000) {
                $fileError.="Sorry, your file is too large.<br>";
                $uploadOk = 0;
            }

            if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg" && $imageFileType != "gif" ) {
                $fileError .= "Sorry, only JPG, JPEG, PNG & GIF files are allowed.<br>";
                $uploadOk = 0;
            }

            if ($uploadOk == 0) {
                $fileError .="Sorry, your file was not uploaded.<br>";
            // if everything is ok, try to upload file
            } else {
                if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
                    $fileError .="The file ". htmlspecialchars( basename( $_FILES["fileToUpload"]["name"])). " has been uploaded.<br>";
                } else {
                    $fileError.= "Sorry, there was an error uploading your file.<br>";
                }
            }
        }else{
            $fileError="Plz select the file";
        }
}
?>