PHP如何避免表单的重复提交_PHP教程
首先,我们可以定义一个session变量用来保存一个表单的提交序列号。这里我定义为“$userLastAction”。然后在表单里加入一个hidden变量,把值设为$userLastAction 1:
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最后,在处理提交之前判断表单是否已被提交过:
if($lastAction>$userLastAction and inputIsValid(...)){
$userLastAction ; // 序列号加1
// 处理表单数据
}
原文:
Avoid multiple form submissions
Submitted By: Douglas E. Cook
Date: 07/26/00 19:46
Does your database suffer from "duplicate post" syndrome? The cure isnt too difficult. Here is a simple way to prevent users from submitting the same form multiple times.
First, declare a session variable to store a serial number for each form. I call mine "$userLastAction." Then, in every form where duplicate submission is a problem, include a hidden field, and set the value to $userLastAction 1:
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Finally, verify that the form has not been previously submitted before acting on the submission:
if($lastAction>$userLastAction and inputIsValid(...)){
$userLastAction ; // Increment serial number
// Act on form here
}
译自:phpbuilder
这只是一个小技巧,用来避免一个表单的重复提交。这样多少可以防止一些灌水的现象,另外有时候由于网络状况等原因用户不知道提交是否成功,也会再次提交同一份表单。
这个技巧的主要原理是不允许用户回退后再次提交,也就是说回退后修改再提交也是不允许的,而且也不能避免Ctrl-C/Ctrl-V的灌水办法。究竟有没有用,还是看各位站长的喜好了