session_is_registered

(PHP 4, PHP 5 < 5.4.0)

session_is_registeredBir küresel değişkenin oturumda kayıtlı olup olmadığına bakar

Açıklama

session_is_registered ( string $isim ) : bool

Bir küresel değişkenin oturumda kayıtlı olup olmadığına bakar.

Uyarı

Bu işlevin kullanımı PHP 5.3.0'dan beri ÖNERİLMEMEKTEDİR ve PHP 6.0.0'da tamamen KALDIRILMIŞTIR. Bu işleve kesinlikle güvenmemelisiniz.

Değiştirgeler

isim

Değişkenin ismi.

Dönen Değerler

Geçerli oturumda isim adında kayıtlı bir değişken varsa TRUEyoksa FALSE döner.

Notlar

Bilginize:

Eğer $_SESSION (veya PHP 4.0.6 ve öncesinde $HTTP_SESSION_VARS kullanılmışsa, değişkenin $_SESSION içinde kayıtlı olup olmadığına bakmak için isset() işlevini kullanın.

Dikkat

$_SESSION (veya $HTTP_SESSION_VARS) dizisini kullanıyorsanız, session_register(), session_is_registered() ve session_unregister() işlevlerini kullanmayın.

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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.
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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
$_SESSION
['test'] = 'Here';
?>
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-9
someone at the dot inter dot net
10 years ago
A simple one-line function to emulate this in later versions of PHP:
function session_is_registered($x){return isset($_SESSION['$x']);}
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-11
paimpozhil at gmail dot com
11 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..
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-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
22 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.
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-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.
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-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{
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-18
CertaiN
10 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().
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