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php中防止post提交重复数据

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Jun 02, 2016 am 09:13 AM

重复提交数据我们在应用中经常会碰到了,今天我给各位介绍利用session来防止用户不小心重复提交数据的一个例子.

原理非常的简单,就是用session在表单页面记录下,然后提交页面判断,如果相等则视为成功,并清空session.

例子,代码如下:

<?php
//开启session
session_start();
//如果有提交标识
if (isset($_GET[&#39;action&#39;]) && $_GET[&#39;action&#39;] === &#39;save&#39;) {
    //如果有session且跟传过来的值一样 www.phprm.com 才算提交
    if (isset($_SESSION[&#39;__open_auth&#39;]) && isset($_POST[&#39;auth&#39;]) && $_SESSION[&#39;__open_auth&#39;] == $_POST[&#39;auth&#39;]) {
        print_r($_POST);
        $_SESSION[&#39;__open_auth&#39;] = null; //清空
        
    } else {
        //走起
        header("location: post.php");
    }
    exit();
}
//授权
$auth = $_SESSION[&#39;__open_auth&#39;] = time();
?> 
<!doctype html> 
<html> 
<head> 
 <meta charset="UTF-8"> 
 <title>post</title> 
</head> 
<body> 
 <form action="post.php?action=save" method="post"> 
  <ul> 
   <li> 
<input type="hidden" name="auth" value="1395454119"> 
<input type="text" name="userName"> 
   </li> 
   <li> 
<input type="password" name="userpass"> 
   </li> 
   <li> 
<input type="submit" value="走起"> 
   </li> 
   <li> 
1395454119   </li> 
  </ul> 
 </form> 
</body> 
</html>

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