How to edit a simple graphing calculator using PHP?

The previous article introduced to you "What interfaces are there in PHP? how to use? 》, this article continues to introduce to you how to use PHP to edit a simple graphing calculator? It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

Simple graphing calculator:

First we create a simple HTML page, give a tag in the HTML, and write us For the graphics to be used, we will find that the running results are as follows:

The running results are as follows

Then we set the attributes (style), and then in the body Enter text in to achieve a centered effect.

In order to accomplish what we want to achieve, we create a new abstract class (class.php). The abstract class we create is to define functions for subclasses. We need to define the name of the shape, the verification method of the shape, the form page of the shape graphic, the area calculation method of the shape, and the perimeter method of the shape calculation. Our rules are ready. The code is as follows:

Then we return to the code just now. When we click on the rectangle, we have to create the rectangle class,

and then call the content inside accordingly. The code is as follows:

The code is as follows:

#So we make a judgment that the get in the if conditional sentence is not empty, then we can design or create a shape object. If it is empty, please Select a calculated graphic, the code is as follows:

The code is as follows:

If we want to create it, we must first get the name of the rectangle,

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