php防止表单重复提交的例子

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心疼五百块大洋 2022-12-05 15:32:37 博主文章分类：php重点知识

<?php
 /*
 * 2016年9月29日08:09:13  郝云云书
 */
 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 $return;
 }
 //如果token为空则生成一个token
 if(!isset($_SESSION['token']) || $_SESSION['token']=='') {
     set_token();
 }
 if(isset($_POST['web'])){
     if(!valid_token()){
         echo "token error，请不要重复提交！";
     }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防止重复提交表单</title>
 <meta name="keywords" content="PHP" />
 <meta name="description" content="PHP防止重复提交表单" />
 </head>
 <body>
 <div id="main">
     <div class="demo">
         <form method="post" action="">  
             <input type="hidden" name="token" value="<?php echo $_SESSION['token']?>">  
             <input type="text" class="input" name="web" value="郝云云">  
             <input type="submit" class="btn" value="提交" />  
         </form>  
     </div>
 </div>
 </body>
 </html>