Can’t keep session continuous between all pages using php

I have created a session in php where users log in and their data is transferred in all the pages.it looks like this

[code=php]<?php ob_start();
session_start();
error_reporting(0);
$_SESSION[‘url’] = $_SERVER[‘REQUEST_URI’];
include ‘cw-config.php’;
if($_SESSION[userid]!=”)
{
$details=mysql_fetch_array(mysql_query(“select * from register where guid=’$_SESSION[userid]'”));
}
?>[/code]

It works on all pages except on this one even though i wrote the code in same manner as above one.it looks like this

[code=php]<?php ob_start();
session_start();
error_reporting(0);
include ‘cw-config.php’;
extract($_POST);
extract($_GET);
$_SESSION[‘url’] = $_SERVER[‘REQUEST_URI’];

if($_SESSION[userid]!=”){
$details=mysql_fetch_array(mysql_query(“select * from register where guid='”.$_SESSION[“userid”].”‘”));
}
$shopdata=mysql_fetch_array(mysql_query(“select * from shop where guid=’$shopid'”));
?>[/code]

Kindly visit:[url]http://rewardsinn.com[/url] the problem is with categories/stores when selected from dropdown menu the session isn’t getting transferred I am new to this coding and had redo everything as we were cheated by a designer.it was working fine till yesterday.Kindly help me in this.Once sign in and check to know the problem.

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