session_start(); $limit = 1; // thoi gian (s) han che giua hai lan truy cap $delay = 2; // thoi gian (s) phai cho de load trang $last = ($_SESSION['time'] == NULL) ? 0 : $_SESSION['time']; $_SESSION['time'] = time(); if ( $limit >= (time() - $last) ) { echo ' Loading ... Loading ... '; exit(0); }