如何上传php到空间

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    if (isset($_FILES["fileToUpload"])) {
        $file = $_FILES["fileToUpload"];
        if ($file["error"] == UPLOAD_ERR_OK) {
            $upload_dir = "uploads/";
            $upload_file = $upload_dir . basename($file["name"]));
            if (move_uploaded_file($file["tmp_name"], $upload_file)) {
                echo "文件成功上传到：" . $upload_file;
            } else {
                echo "文件移动失败！";
            }
        } else {
            echo "文件上传失败！";
        }
    }
}
?>