PHP重命名/更改特色图片

Question

I'm trying to make a PHP script that changes the featured picture of some item. The general principle is that it when $_POST['featured'] is set, it renames that picture to featured.jpg and renames all other pictures to their hash_file value. However, it works well the first time when there is no featured picture set, but when I try to change it from one featured picture to another, the previous featured picture gets removed and the new one doesn't get renamed to featured.jpg. All pictures are in the same folder.

Here is the relevant code:

if (isset($_POST['featured'])) {
    $id = $_POST['id'];
    $slike = glob('../img/uploads/'.$id.'/*.{jpg,png}', GLOB_BRACE);
    if ($slike != null) {
        foreach ($slike as $slika) {
            $path = realpath($slika);
            $name = basename($path);
            if($name == basename($_POST['featured'])){
                if(!file_exists(dirname($path) . '/featured.jpg')){
                    rename($path, dirname($path) . '/featured.jpg');
                }else{
                    rename(dirname($path) . '/featured.jpg', dirname($path) . '/' . hash_file('md5', $path) . '.jpg');
                    rename($path, dirname($path) . '/featured.jpg');
                }
            }else{
                rename ($path, dirname($path) . '/' . hash_file('md5', $path) . '.jpg');
            }
        }
    }
}