AJAX到PHP不使用NODEJS将数据发送到数据库

I'm currently developing a chat project.. I'm using a php framework and have managed to run it on node now the problem I'm currently experiencing is that the ajax query is not working it does not send a single data to my database.. the script that I used is perfectly working because I used this script when I was still using a long-polling of ajax for a chat app... It just didnt work now when I used it on the new chat app using node that I was developing... Here is my index.php I'm currently developing a chat project.. I'm u