api for php IP Bindings

i have this code

<?php require('routeros_api.class.php'); include 'include/global.php'; include 'include/function.php'; $username = $_GET['user']; $sql = "SELECT user_macaddress FROM demo_user WHERE user_name='".$username."'"; $result1 = mysql_query($sql); $mac = mysql_fetch_array($result1); $API = new RouterosAPI(); $API->debug = true; if ($API->connect('192.168.88.1', 'admin', '1')) { $API->write('/ip/hotspot/ip-binding/add',false); $API->write('=type=bypassed',false); $API->write("=mac-address='".$mac."'",true); $READ = $API->read(); $API->disconnect(); ob_clean(); header("location:http://google.com"); } \ \ ?>

i use the php api for mikrotik for add the mac address automatically, but the mac address never shown in my ip bindings in winbox. can u guys help me with this?