Add a specific redirect to a complicated PHP site

We need to redirect [login to view URL] to [login to view URL] The site has lots of complexity but this might be done in one of the config files: <?php if(!($archSite)&&!($mainSite)){ $explode=explode('/',$_SERVER['PHP_SELF']); if(count($explode)>3){ header("Location: [login to view URL]".$_SERVER['PHP_SELF']); } } define(ROOT,LSROOT); define(IMGROOT2011,ROOT.'/images/'); if($mainSite){ define(WEBROOT,'[login to view URL]'); define(IMAGES2011,WEBROOT.'/images/'); }else if($archSite){ define(WEBROOT,'[login to view URL]'); define(IMAGES2011,WEBROOT.'/images/'); }else{ define(WEBROOT,LSWEB); define(IMAGES2011,WEBROOT.'/images/'); } ?>