PHP Velho Oeste 2024

session_is_registered

(PHP 4, PHP 5 < 5.4.0)

session_is_registeredFind out whether a global variable is registered in a session

Description

session_is_registered ( string $name ) : bool

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

Warning

This function has been DEPRECATED as of PHP 5.3.0 and REMOVED as of PHP 5.4.0.

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 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().

add a note add a note

User Contributed Notes 9 notes

up
8
pk at majstar dot com
9 years ago
There's an error in the comment posted by "someone at the dot inter dot net". Correct replacement for function session_is_registered() in PHP 5.4+ is

function session_is_registered($x) {return isset($_SESSION[$x]);}

so just $x instead of '$x' - single quotation mark won't interpolate the variable $x and the function will always return false.
up
3
amol_bhavsar1982 at hotmail dot com
15 years ago
session_register() function is generating warnings. Therefore, instead of using:

<?php
$test
= 'Here';
session_register('test');
?>

It is better :

<?php
$_SESSION
['test'] = 'Here';
?>
up
-9
someone at the dot inter dot net
10 years ago
A simple one-line function to emulate this in later versions of PHP:
function session_is_registered($x){return isset($_SESSION['$x']);}
up
-11
paimpozhil at gmail dot com
10 years ago
For those who have an older application which uses the session_is_registered..and you want to use that in php5.4

You can just define the function if required

function session_is_registered($x)
{
    if (isset($_SESSION['$x']))
    return true;
    else
    return false;
}

May be add the checks to ensure function is not already existing..
up
-12
someone at the dot inter dot net
10 years ago
A simple one-line function to emulate this in later versions of PHP:
function session_is_registered($x){return isset($_SESSION['$x']);}
up
-8
miguel dot simoes at swirve dot com
21 years ago
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.
up
-14
vectorjohn at example dot com
10 years ago
The proper equivalent has nothing to do with isset().

Use array_key_exists() because session_is_registered returns true if the variable is in the session at all, even if it's falsy.
up
-19
Sami
10 years ago
I can not get the following code to work as it is returning an error on the session_is_registered() and do I have to change anything else in the code

Thank you

if(!session_is_registered('user_name')){

if (isset($_POST['username'])) {
$password1 = clean($_POST["password"]);
$username1 = clean($_POST["username"]);
$password2 = crypt($password1);

$result = @mysql_query ("select * from users where user_name = '".$username1."'");
$lim = @mysql_num_rows( $result );
//|| (strlen($username1) < 6) || (strlen($password1) < 6)
if( ($lim!=0)  ){
$row = @mysql_fetch_array($result);
$password=$row['user_password'];
if (crypt($password1, $password) == $password){
$sql = @mysql_query ("insert into logs (ip, cdate, status) values ('".$REMOTE_ADDR."','". date("Y-m-d H:i:s") ."', 'Login')");
session_register('user_id');
session_register('user_fullname');
session_register('user_name');

$_SESSION['user_name'] = $row['user_name'];
$_SESSION['user_fullname'] = $row['user_fullname'];
$_SESSION['user_id'] = $row['user_id'];
}//if crypt
else{
up
-18
CertaiN
9 years ago
If your session variables may have NULL value,  use array_key_exists() instead of isset(). If not, use isset() because it performs better than array_key_exists().
To Top