本文執行個體講述了PHP實現防止表單重複提交功能。分享給大家供大家參考，具體如下：
防止表單重複提交的方法有很多種，那麼今天就給大家介紹一種php如何有效防止表單重複提交。
代碼非常簡單
我相信大家很聰明給大家分享一個小的demo，大家可以借鑒一下：
具體代碼：
<?php/** 2016年9月29日08:09:13*/session_start();header("Content-Type: text/html;charset=utf-8");function set_token() { $_SESSION['token'] = md5(microtime(true));}function valid_token() { $return = $_REQUEST['token'] === $_SESSION['token'] ? true : false; set_token(); return $return;}//如果token為空白則產生一個tokenif(!isset($_SESSION['token']) || $_SESSION['token']=='') { set_token();}if(isset($_POST['web'])){ if(!valid_token()){ echo "token error，請不要重複提交！"; }else{ echo '成功提交，Value:'.$_POST['web']; }}else{?><!DOCTYPE html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1"><title>PHP防止重複提交表單</title><meta name="keywords" content="PHP" /><meta name="description" content="PHP防止重複提交表單" /></head><body><p id="main"> <p class="demo"> <form method="post" action=""> <input type="hidden" name="token" value="<?php echo $_SESSION['token']?>"> <input type="text" class="input" name="web" value="指令碼之家"> <input type="submit" class="btn" value="提交" /> </form> </p></p></body></html><?php }?>
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