(PHP 4 >= 4.0.0)
session_is_registered -- Find out if a variable is registered in a session
Description
bool session_is_registered (string name)
session_is_registered() returns TRUE if there is a 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.
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