เขียน PHP 5.2.6 แต่ โดน Update ให้เป้น PHP 5.4 มันเปลี่ยนจนงง

<?php
@session_start();
$path = "../../../include/";
include($path."database_info.php");

$process =  $_POST["process"];
$tel = $_POST["tel"];
$email = $_POST["email"];

if(isset($format)){
	date($format);
	}
$dates = date("Y-m-d H:i:s");

?>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?php
if($process == "edit_data"){
		$data_update = array(
				tel => $tel,
				email => $email,
				UPDATE_TABLE => $dates
		);
		$db->update($data_update,"user"," where uid = '".$_SESSION["c_id"]."'");
		$_SESSION["c_em"] = $email;
		echo "<script>alert('แก้ไขข้อมูลผู้ใช้เรียบร้อย');window.location.href = '../student_edit_data.php';</script>";
	}
?>