Home Backend Development PHP Tutorial php页面防重复提交方法总结_php技巧

php页面防重复提交方法总结_php技巧

May 17, 2016 am 08:52 AM
php repeated submit

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

复制代码 代码如下:

        $("#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

复制代码 代码如下:

      $('#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

复制代码 代码如下:

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

复制代码 代码如下:

 /**
     * 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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