最后的XML项目无法从XML中删除

I have two php documents that has this same logic. One document is "uploader.php, which writes to the xml once file is upload. The other document is "modifier.php", which writes to the xml once file the is removed. I have two issue with this logic. First issue is deleting last item in the xml list. It doesn't delete the last item and also duplicates the second to last items. Second issue is with it is logging a error on my "uploader.php".I have two php documents that has this same log