Can't read from sessions?

Hello guys.I'm trying to take a variable from a php file and print it in my game in unity.The problem is that i don't know how to do it with sessions.When the player logs in i want to take all his stats(health money attack name) and put it into sessions so i can call them wherever i want.When i simple echo something,unity can show it on my screen but if i try to echo a session unity won't do anything.Any ideas?Here is my source codes

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using UnityEngine.UI;
4.  
5. public class displayDataFromPhp : MonoBehaviour
6. {
7.     public Text dis;
8.     string answer;
9.     string url = "http://localhost/CodeIgniterUnity/index.php/Users/";
10.  
11.  
12.     public void Start()
13.     {
14.        
15.         WWW get_www = new WWW(url);
16.         StartCoroutine(WaitForRequest(get_www));
17.  
18.     }
19.     //Our Coroutine for getting the data
20.     IEnumerator WaitForRequest(WWW www)
21.     {
22.         yield return www;
23.  
24.         // check for errors
25.         if (www.error == null)
26.         {
27.  
28.             //Assign the data that was fetched to the variable answer
29.             answer = www.text.ToString();
30.         }
31.         else {
32.             Debug.Log("WWW Error: " + www.error);
33.          
34.         }
35.     }
36.  
37.     //GUI Components
38.  
39.     void OnGUI()
40.     {
41.         dis.text = answer;  
42.         Debug.Log(answer);
43.  
44.  
45.     }
46. }

and my php code

I've already set the sessions in an other file!