This cool PHP script takes an expression, f(x) and calculates all the roots between a start and end point. It also provides a nice graphical output which can be saved.

Here is  a sample output:

You can try it yourself here. The code is downloadable from phpclasses.org.

This class takes x(t) and y(t) as a parametric equation and draws its diagram in jpeg format.

Here is a sample output:

Try it yourself. You can download the code here.

Here I'm introducing an interesting PHP program.

You can pass an expression, f(x) and a range for your x variable and it draws the functions diagram for you. The generated diagram can be saved an a normal image.

Here you can see a sample diagram for f(x) = sin(x/10)

Try it yourself here. The code also can be downloaded from phpcclasses.org .

When I was a student at universoty, I used to do lots of scientific PHP programs just for fun. Here is the one I really like. After 7 years I still can spend time playing with it and graw really cool graphs.

This PHP application takes 3 parametric expressions for x, y and z dimentions and draws the 3D graph representing the expressions. You can also save the result as an ordinary image. This program is really useful for students who like mathematics and algebra. 

t, is the variable which changes within the range you provide so foreach specific t, we will get a x, y and z values which will form our cool 3D graph

Here is a sample output:

You can try it here. Just make sure you type the expressions in C++ (PHP) format. This code can be downloaded here.