PHP防止刷新重复提交页面的示例代码

if (isset($_POST['action']) && $_POST['action'] == 'submitted') { session_start(); if (isset($_SESSION['submit_time']) && $_SESSION['submit_time']==0){ print '<pre>'; print_r($_POST); print '<a href="'. $_SERVER['PHP_SELF'] .'">Please try again</a>'; print '</pre>'; $_SESSION['submit_time']=1; echo $_SESSION['submit_time']; unset($_SESSION['submit_time']);} else { print '<pre>'; print_r($_POST); echo "However you have submitted"; print '</pre>'; } } else { session_start() or dir("session is not started"); $_SESSION['submit_time']= 0; // isset($_SESSION['submit_time']) or die ("session var is not created"); // echo $_SESSION['submit_time']; ?> <form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST"> Name: <input type="text" name="personal[name]"><br> Email: <input type="text" name="personal[email]"><br> Beer: <br> <select multiple name="beer[]"> <option value="warthog">Warthog</option> <option value="guinness">Guinness</option> </select><br> <input type="hidden" name="action" value="submitted"> <input type="submit" name="submit" value="submit me!"> </form> <?php } ?>