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Last updated: Fri, 26 Jan 2007

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# session_is_registered

(PHP 4, PHP 5)

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.

> Замечание: 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`.

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

add a note User Contributed Notes
session_is_registered
somedude at wholikesphp dot com
31-Oct-2002 10:02
`Just to elaborate for those who may be having some problems.
If you're using a newer version of PHP that comes with the register globals directive set to "off", you should heed the caution at the top of these notes. It's easier anyway.
Instead of using session_register(...) , simply use somethig like:
<?
//must always start the session first
session_start();
//in place of session register(..) use...like someone said above
$_SESSION['VARNAME'] = $something // or "something";
/* then on the same page or subsequent pages where you want check for the session use something like....
and on another page where the session hasn't been started you have to call session_start(); first, if the session has already been started you don't need to call it again */
session_start();
//instead of session_is_registered();
if(isset($_SESSION['VARNAME']))
{
print("What you want if the session var is set");
}
else
{
print("What you want if the sessions variable is not set");
}
?>
I hope this helps someone! If you want to learn more about $_SESSION and/or it's related "superglobals" try
http://www.php.net/manual/en/printwn/language.variables.predefined.php
good road!`
miguel dot simoes at swirve dot com
13-Jun-2002 04:27
`When using PHP 4.2.0 even on the same page where you registered the variable with:
session_register("someVar");
if you try to see if the variable is set and do not assign it a value before, the function used in the previous comment will give the same output.
This may show that the variable is declared and will not be set until some value is give assign to it.
I think that this way will give the option to register all the variables used for sure on the process on the first page and using them as the time comes.`
add a note
session_module_name session_id

Last updated: Fri, 26 Jan 2007
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