php ajax多个请求

Question

I been learning php and ajax from w3schools but I have come across a simply question for which I cant find an answer to.

To request something from a php file I use a xmlhttpRequest object and specify the url (of that php file). Does this mean one php file for one request only? Let's say on a webpage there are a user log-in box and a comment box, I would need two php files to take the requests? I always thought the server side will have one main file that handle all the requests, each request from client will have a ID to specify what the request is and send back the necessary data to client. So what is the right?

I read a lot of material online, but everything is just basic example with just one request and one response.

Answer 1

You can use the same file for multiple requests. You can supply parameters along with the AJAX request, either by including them in the URL after ? (they'll be available in $_GET and $_REQUEST) or by using the POST method and sending them as form data (they'll be available in $_POST and $_REQUEST). You can use the Javascript FormData API to encode this properly; see the documentation here. Using the jQuery library can simplify all of this.

One of the parameters can then be a command or operation code, and the script can take different actions based on this.