php防止表单的重复提交
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在php中如何防止表单的重复提交,下面分享一种方法。
/*
* 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
}
?>
其它参考方法:
1、在页面生成随机码,也就是每次提交随机码都不一样,在提交的时候验证随机码!
2、在提交的时候,验证如果数据存在,就不提交了。

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