PHP Is there a better way to protect my pages than using header(location)?

[Patrick Spewing]

I am protecting my pages by checking the values of my sessions. Is there a more secure way of protecting my pages other than changing the Header Location if the sessions are not valid??? Am I doing anything right???I have the following at the top of each page:\[code\]<?php session_start(); //VERIFY LOGIN $validkey = 'br1ll1ant)=&'; if ($_SESSION['valid'] != (hash('sha256',$validkey)) && $_SESSION['tokenconfirm'] != hash('sha256',$_SESSION['tokenID'])) { header("location:/login/"); };?>\[/code\]