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['action']) && $_GET['action'] === 'save') {
//如果有session且跟传过来的值一样 www.phprm.com 才算提交
if (isset($_SESSION['__open_auth']) && isset($_POST['auth']) && $_SESSION['__open_auth'] == $_POST['auth']) {
print_r($_POST);
$_SESSION['__open_auth'] = null; //清空
} else {
//走起
header("location: post.php");
}
exit();
}
//授权
$auth = $_SESSION['__open_auth'] = 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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