How to use Paypal Standard in a web application with PHP

I'm looking for a way to build a web application using paypal payments standard. I'd like the user to get redirected to paypal, then fill out their information, and upon completion, add a value in our database saying that they successfully paid. I haven't found a solution or answer to this.

I found this thread for RoR, but didn't find anything for PHP

Paypal Website Payments Standard wi开发者_如何学JAVAth a Ruby/Rails application

You can see instructions for a Payment Data Transfer at PayPal's site. Basically, you post the transaction amount and an ID token to their site, the customer pays on paypal.com, and then they're sent back to a pre-defined URL on your site with the transaction details.

I used the NVP API to do that.