<?php/** PHP简单利用token防止表单重复提交* 此处理方法纯粹是为了给初学者参考*/session_start();function set_token() {    $_SESSION[‘token‘] = md5(microtime(true));}function valid_token() {    $return = $_REQUEST[‘token‘] === $_SESSION[‘token‘] ? true : false;    set_token();    return $return;}//如果token为空则生成一个tokenif(!isset($_SESSION[‘token‘]) || $_SESSION[‘token‘]==‘‘) {    set_token();}if(isset($_POST[‘test‘])){    if(!valid_token()){        echo "token error";    }else{        echo ‘成功提交，Value:‘.$_POST[‘test‘];    }}?><form method="post" action="">    <input type="hidden" name="token" value="http://www.mamicode.com/<?php echo $_SESSION[‘token‘]?>">    <input type="text" name="test" value="http://www.mamicode.com/Default">    <input type="submit" value="http://www.mamicode.com/提交" /></form>