php - Subdomain Session Issue -

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I am trying to access session data on multiple wildcard subdomains. I set the session using the following: 

  & lt ;? Php session_name ("session"); Session_set_cookie_params (0, '/', '.example.com'); Session_start (); $ _SESSION ['MID'] = 1 9 2; ? & Gt;   
 I set the above session to  sub1.example.com . I then go to  sub2.example.com  and I use the following code to use the session:  
  & lt ;? Php session_name ("session"); Session_set_cookie_params (0, '/', '.example.com'); Session_start (); Print_r ($ _ session); ? & Gt;   
 But the session is empty. What am I missing?   
 
 
 You tried to use:  
  session_regenerate_id (true) );             P>

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