Using PHP to implement a simple subtraction calculator function

Source: Internet
Author: User
Subtraction Calculator Presumably everyone has used it, this article for you to introduce how to use PHP to achieve

Calculator for small programs written in PHP base language

Requirements: Enter numbers in the input box to add, subtract, multiply, divide (html+php)

Ideas:

1 first to create input boxes for entering numbers and operators, number with the Text property of input, operator with SELELCT option property

2 Click the = number in the input box to perform the corresponding operation,

3 = number This input box can be done with the submit of input, just click on the contents of the submit form and pass it to PHP.

4 Judging the operators that are obtained from HTML for the corresponding operation

5 When the operation is complete, return the result to the table consignments (which is the value assignment to the form)

The code is as follows:

<?php header ("Content-type:text/html;charset=utf-8"); Session_Start ();?> <! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "Http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd "> 
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