util.php

    /**
    * Redirect to the user default page
    */
    public static function redirectToDefaultPage(){
        OC_Log::write('core','redirectToDefaultPage',OC_Log::DEBUG);
        if(isset($_REQUEST['redirect_url']) && /*(*/substr($_REQUEST['redirect_url'], 0, strlen(OC::$WEBROOT)) == OC::$WEBROOT /*|| $_REQUEST['redirect_url'][0] == '/')*/) {
            header( 'Location: '.$_REQUEST['redirect_url']);
        }
        else if (isset(OC::$REQUESTEDAPP) && !empty(OC::$REQUESTEDAPP)) {
            header( 'Location: '.OC::$WEBROOT.'/?app='.OC::$REQUESTEDAPP );
        }
        else {
            header( 'Location: '.OC::$WEBROOT.'/'.OC_Appconfig::getValue('core', 'defaultpage', '?app=files'));
        }
        exit();
    }