PHP简单利用token防止表单重复提交
<?php session_start(); function set_token() { $_SESSION['token'] = md5(microtime(true)); } function valid_token() { $return = $_REQUEST['token'] === $_SESSION['token'] ? true : false; set_token(); return $return; } //如果token为空则生成一个token if( !isset($_SESSION['token'] ) || $_SESSION['token'] == '' ) { set_token(); } if(isset($_POST['test'])){ if(!valid_token()){ echo "token error"; }else{ echo time(); } } ?> <form method=post action=""> <input type="hidden" name="token" value="<?=$_SESSION['token']?>"> <input type="text" name="test" value="value"> <input type="submit"> </form>