(PHP 4 , PHP 5)
session_is_registered -- Find out whether a global variable is registered in a sessionsession_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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