8）post方式提交和简单那处理

带有htmll的代码：

　　　　　　　　　　实现简单的计算器

 1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 2 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn">
 3 <head>
 4     <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
 5     <title>网页标题</title>
 6     <meta name="keywords" content="关键字列表" />
 7     <meta name="description" content="网页描述" />
 8     <link rel="stylesheet" type="text/css" href="" />
 9     <style type="text/css"></style>
10     <script type="text/javascript"></script>
11 </head>
12 <body>
13     <form  action="5post_2.php"  method="post" >
14         <input type="text"   name="n1"   />
15         <select name="yunsuanfu" >
16             <option value="+" >+</option>
17             <option value="-" >-</option>
18             <option value="*" >*</option>
19             <option value="/" >/</option>
20         </select>
21         <input type="text"   name="n2"   />
22         <input type="submit"  value="提交"  />
23     </form>
24 </body>
25 </html>

PHP处理代码：

 1 <?php
 2     /**
 3      * Created by PhpStorm.
 4      * User: Interact
 5      * Date: 2017/4/13
 6      * Time: 21:31
 7      */
 8     
 9  $v1=$_POST['n1'];
10  $v2=$_POST['n2'];
11  $fuhao=$_POST['yunsuanfu'];
12  if($fuhao==='+'){
13      echo $v1+$v2;
14  }elseif($fuhao==='-'){
15      echo $v1-$v2;
16      
17  }elseif($fuhao==='*'){
18      echo $v1*$v2;
19  }
20  else{
21      echo $v1%$v2;
22  }
23 
24     
25 
26