[PHP]防止表单重复提交的几种方法

<span>/*</span><span>
|---------------------------------
|原理 & 代码示例
|@黑眼诗人 <www.farwish.com>
|---------------------------------
</www.farwish.com></span><span>*/</span>
<span>//</span><span>服务端生成随机数存入session, 分配至表单页</span>
<span>$data</span>['sess_id'] = <span>$_SESSION</span>['sid'] = <span>mt_rand</span>(1000, 9999<span>);
</span><span>$this</span>->load->view('form', <span>$data</span><span>);

</span><span>//</span><span>表单页隐藏域存放此session值</span>
<input type="hidden" name="sid" value="<?=<span>$sess_id</span>; ?>">

<span>//</span><span>处理</span>
<span>if</span>(<span>$_POST</span>['sid'] != '' && $_POST['sid'] == $_SESSION['sid']<span>)
{
　</span><span>unset</span>(<span>$_SESSION</span>['sid'<span>]);

　</span><span>echo</span> '处理数据'<span>;
}
</span><span>else</span><span>
{
　</span><span>echo</span> '已提交过表单'<span>;
}</span>