PHP - How to make/generate a graph image depending on values in a database?

Question

Hello. How could I make an image graph from values in a database? The idea came from "Steam", which uses a graph to show how many users are online. How could I do the same thing? It seems like the graph is one whole image; not made up of parts. Here's an image of the graph from Steam:

Thanks.

Answer 1

Use this GD module from PHP. http://php.net/manual/en/book.image.php

Answer 2

You will mainly need to keep a track of how many users were connected at each period of time. Drawing the graph is easy, they are some really neat library to help you with it. ;)

Answer 3

+1 for Svisstack's link. Here's another one (less supported, less documented, but more features): http://www.php.net/imagick

Answer 4

You want to use JPGraph, it is a very power PHP graphing library. http://www.aditus.nu/jpgraph/

Answer 5

The easiest way is using the Google Chart API. You can generate a graph by simply creating a url with your values (basic example)

Answer 6

I use FLOT with Jquery -> http://code.google.com/p/flot/

I find it easier to work with CSS than GD library to get the layout I want.

Answer 7

if you are the javascript lover use this, http://raphaeljs.com/

they keep updating and many advance function.