   #PHP Manual Session handling functions session_id session_module_name

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                             session_is_registered

   (PHP 4 )
   session_is_registered --  Find out whether a global variable is
   registered in a session

Description

   bool session_is_registered ( string name)

   session_is_registered() returns TRUE if there is a global variable
   with the name name registered in the current session.

     Note: If $_SESSION (or $HTTP_SESSION_VARS for PHP 4.0.6 or less) is
     used, use isset() to check a variable is registered in $_SESSION.

   Caution

   If you are using $_SESSION (or $HTTP_SESSION_VARS), do not use
   session_register(), session_is_registered() and session_unregister().
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