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session_is_registered

Find out whether a global variable is registered in a session (PHP 4, PHP 5)
bool session_is_registered ( string name )

Finds out whether a global variable is registered in a session.

Parameters

name

The variable name.

Return Values

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

Notes

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().