php页面防重复提交方法总结_php技巧
1、提交按钮置disabled
当用户提交后,立即把按钮置为不可用状态。这种用js来实现。
提交前
$("#submit").attr('disabled','true');
$("#submit").val("正在提交,请稍等");
....................................................................................
执行后,把按钮置为原来状态
$('#submit ').removeAttr('disabled');
$("#submit ").val("确定提交");
2、过期时间法
思路:当用户提交按钮后生成一个token(每次业务提交token 为唯一值)存入session,并设置过期时间。当用户再此提交时,检测token是否一致且是否过期,若一致且没有过期,则认为提交了二次。当程序执行出错的时候,则需要清除存入session的值。见下面程序
function checkRepeatSubmit($uniqueid = '', $expire = 30) {
$uniqueid = empty($uniqueid) ? Yii::app()->user->id . Yii::app()->user->name . Yii::app()->user->mihome : $uniqueid;
$token = md5("wms_check_repeat" . $uniqueid);
$time = time();
if (isset($_SESSION['token']) && !empty($_SESSION['token']) && $_SESSION['token'] == $token && ($time - $_SESSION['expire_time']
return false;
} else {
$_SESSION['token'] = $token;
$_SESSION['expire_time'] = $time;
//session写入的时候会等待整个页面加载完成,用此函数可以立即写入
session_write_close();
return true;
}
}
//删除存入的值
function cancelRepeatSubmit() {
unset($_SESSION['token']);
unset($_SESSION['expire_time']);
}
3、token销毁法
思路:当页面进行加装的时候生成token,存在session中,并写在表单里。表单提交的时候随表单提交给服务端,服务端通过session存入的token与token进行比较,若相等,则销毁seesion中存入的token,当页面遭到二次提交的时候,由于存入session中的token不存在而报错。下面是代码
/**
* 第二种方案
* 1、产生token,并存在session中
* 2、随页面生成
* 3、提交页面与session进行比对,成功后对session进行销毁
* 4、第二次提交则不存在这个值而报错
* @param type $uniqueid
* @return type
*/
function createToken($uniqueid) {
$uniqueid = empty($uniqueid) ? Yii::app()->user->id . Yii::app()->user->name . Yii::app()->user->mihome : $uniqueid;
$token = md5("wms_check2_repeat" . $uniqueid);
$_SESSION['form_token'] = $token;
session_write_close();
return $token;
}
function checkToken($token) {
if (!isset($_SESSION['form_token']) || empty($_SESSION['form_token']) || $_SESSION['form_token'] != $token) {
return false;
} else {
unset($_SESSION['form_token']);
return true;
}
}
上面总结了三种方法,个人感觉第一种跟第二种方法配合着用会达到更好的效果。第二种方法与第三种方法个人感觉第三种要有优势点。
第二种与第三种方法都是把token写在session中,这种方法好处是节省存储空间,但坏处是由于session是需要整个页面加载完毕才能写入,故当整个页面加载比较慢,且用户点击多次提交,可能由于session还没写入导致系统还认为是第一次输入。导致验证不起作用。好在php函数提供了一个牛逼的函数。 session_write_close(),可以立即把session写入,不用等待页面加载完成。同事对于session的存入也有很多种方法可以选择,可以存在redis,memcache或者数据库都可以的。

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