php - not all session variables are stored in ie on windows phone -

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the following code runs when user logs in:

    $old_session = $_session;     session_write_close();     session_id(sha1(mt_rand()));     session_start();     $_session = $old_session;     $_session['user'] = $userid;//set userid     $_session['last_login'] = getlastlogin($_session['user'], true, $conn);//gets last login date

the user info isn't saved in ie on windows phone 7, other session data has been saved, body knows can cause , how fix it? ps. cookies stored, other session information saved. session file made , can see other data, not user , last_login.


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