php - Form Upload Error After Changing Server

I had a working upload form and then recently bought a dedicated hosting plan (GoDaddy - yes, evil I know) for the site that I had been working on on a pre-existing plan. However, although the file structure is exactly the same with full write permissions, the upload no longer works, but the database is updated, despite the DB only being updated if an image is present. I don't understand why the file is no longer being uploaded:

if ($state == "post") {
    $title = $_POST['title'];
$body = $_POST['body'];
if(! empty($_FILES['file']['name'][file])) {
    $allowed_extensions = array("jpeg", "jpg", "png");
    $upload_extension = end(explode(".", $_FILES['file']['name'][file]));
    if (in_array($upload_extension, $allowed_extensions)) {
    $loop = true;
    $im = null;
    while ($loop) {
        $rand_count = 0;
        while ($rand_count != 10) {
            $rand = rand(1,9);
        $im = $im . $rand;
        $rand_count++;
        }
        $image = $im.".".$upload_extension;
        if (!file_exists("images/posts/" . $image)) {
            list($width, $height) = getimagesize($_FILES['file']['tmp_name'][file]);
        if ($height > $width)
                        $width_n = 160; $height_n = $height/$width*$width_n;
        else
            $height_n = 160; $width_n = $width/$height*$height_n;

            $tmp_image = imagecreatetruecolor($width_n, $height_n);
        if (($upload_extension == "jpeg") || ($upload_extension == "jpg"))
                        $src = imagecreatefromjpeg($_FILES['file']['tmp_name'][file]);
        elseif ($upload_extension == "png")
            $src = imagecreatefrompng($_FILES['file']['tmp_name'][file]);
        //tmp_upload 
        imagecopyresampled($tmp_image, $src, 0, 0, 0, 0, $width_n, $height_n, $width, $height);
        $path = "images/posts/".$image;
        imagejpeg($tmp_image, $path, 100);
                    $stmt = "INSERT INTO posts (post_title, post_body, post_image) VALUES ('$title', '$body', '$image')";
        if (!mysqli_query($con, $stmt))
                        die('Error: ' . mysqli_error($con));
            $loop = false;
        header('Location: index.php');
        }
    }
    }
}
}
Copy code

images/posts exists on the new server.