解决php表单重复提交实现方法，php表单重复提交
解决php表单重复提交实现方法，php表单重复提交
重复提交是我们开发中会常碰到的一个问题，除了我们使用js来防止表单的重复提交，同时还可以使用php来防止重复提交哦。
<?php
/*
* php中如何防止表单的重复提交
*/
session_start();
if (empty($_SESSION['ip'])) {//第一次写入操作，判断是否记录了IP地址，以此知道是否要写入数据库
$_SESSION['ip'] = $_SERVER['REMOTE_ADDR']; //第一次写入，为后面刷新或后退的判断做个铺垫
//...........//写入数据库操作
} else {//已经有第一次写入后的操作，也就不再写入数据库
echo '请不要再次刷新和后退'; //写一些已经写入的提示或其它东西
}
?>
具体原理
session范围变量token来防止。
1. 开启session:
session_start();
2. 如果有表单提交
if (isset($token))
token以hidden的形式包含在form当中。
<input type="hidden" name="token" value="<?php echo $token; ?>" />
3. 如果是重复提交表单
if ($_SESSION["token"] != $token) {
// 不让重复提交，在此处理
// header("location:".$_SERVER['PHP_SELF']);
} else {
// 正常的表单提交，在此处理
// echo "已提交";
}
4. 设置token值
$token = mt_rand(0,1000000);
2$_SESSION['token'] = $token;
以上就是关于如何解决php表单重复提交实现方法，希望对大家的学习有所帮助。
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