php 检查是否设置了会话变量，否则重定向用户

Posted 2021-05-04

<?php 

// this script checks if a user is logged in when visiting a page otherwise it will redirect back to login

   if(!isset($_SESSION['variable_name'])){ // if session variable is not set e.g user_id 
      header("Location: URL"); // redirect to specified url
      exit(); // exit script
   }

?>