session_register

(PHP 4, PHP 5 < 5.4.0)

session_register Registra una o più variabili con la sessione corrente

Descrizione

bool session_register ( mixed $name [, mixed $... ] )

session_register() accetta un numero di argomenti variabile, ognuno dei quali può sia essere una stringa contenente il nome di una variabile o un array che contiene i nomi delle variabili o altri arrays. Per ogni nome, session_register() registra la variabile globale con quel nome nella sessione corrente.

Attenzione

Questo registra un variabile global. Se volete registrare una variabile di sessione interna a una funzione, avete bisogno di assicurarvi di farla globale usando global() o usate gli arrays di sessione come scritto sotto.

Attenzione

Se state usando $HTTP_SESSION_VARS/$_SESSION, non usate session_register(), session_is_registered() e session_unregister().

Questa funzione restituisce TRUE quando tutte le variabili sono registrate con successo nella sessione.

Se session_start() non è stata chiamata prima che questa funzione venga chiamata, avverrà una chiamata imlicita senza parametri a session_start().

Potete anche creare una variabile di sessione semplicemente impostando l'appropriato membro di $HTTP_SESSION_VARS o $_SESSION (PHP >= 4.1.0) array.

$barney = "Una grande torta fiammeggiante.";
session_register("barney");

$HTTP_SESSION_VARS["zim"] = "Mars attack.";

# the auto-global $_SESSION array was introduced in PHP 4.1.0
$_SESSION["spongebob"] = "Ha i pantaloni a quadri.";

Nota:

Non è possibile registrare risorse variabili in una sessione. Per esempio, non potete creare una connessione a un database e archiviare l'id della connessione come una variabile di sessione e aspettarvi che la connessione sia ancora valida la prossima volta che la sessione viene riastabilita. Le funzioni PHP che restituiscono una risorsa sono identificate avendo un tipo di restituzione resource nelle loro definizioni di funzione. Una lista di funzioni che restituisce risorse è disponibile nell'appendice resource types.

Se viene usata $_SESSION (o $HTTP_SESSION_VARS per PHP 4.0.6 or inferiore), assegna la variabile a $_SESSION. i.e. $_SESSION['var'] = 'ABC';

Vedere anche session_is_registered() e session_unregister().

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User Contributed Notes 12 notes

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8
rob at akrabat dot com
5 years ago
if you remove session_register() calls and replace with $_SESSION assignments, make sure that it wasn't being used in place of session_start(). If it was, you'll need to add a call to session_start() too, before you assign to $_SESSION.
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4
Ezion oudpapierdoos at gmail dot com
4 years ago
Below is a fix that may be included in older code to make it work with PHP6.
When needed it recreates the functions
- session_register()
- session_is_registered()
- session_unregister()

The functions inside the function fix_session_register() are only available  after fix_session_register() has run.
Therefore in PHP<6 where there already is a session_register() nothing happens.

<?php
// Fix for removed Session functions
function fix_session_register(){
    function
session_register(){
       
$args = func_get_args();
        foreach (
$args as $key){
           
$_SESSION[$key]=$GLOBALS[$key];
        }
    }
    function
session_is_registered($key){
        return isset(
$_SESSION[$key]);
    }
    function
session_unregister($key){
        unset(
$_SESSION[$key]);
    }
}
if (!
function_exists('session_register')) fix_session_register();
?>


[EDIT BY danbrown AT php DOT net: Bugfix provided by "dr3w" on 02-APR-2010: "its [sic] function_exists with an S at the end".]
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1
yarco dot w at gmail dot com
4 years ago
You *MUST* notice that

session_register($var)

*IS NOT*

$_SESSION[$var] = $$var;

it is

if (!isset($_SESSION[$var]))
  $_SESSION[$var] = $$var;

when migrating from old style code.
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0
mikej
10 years ago
I've noticed that if you try to assign a value to a session variable with a numeric name, the variable will not exist in future sessions.
For example, if you do something like:
session_start();
$_SESSION['14'] = "blah";
print_r($_SESSION);

It'll display:
Array ( [14] => "blah" )

But if on another page (with same session) you try
session_start();
print_r($_SESSION);

$_SESSION[14] will no longer exist.

Maybe everyone else already knows this, but I didn't realize it until messing around with a broken script for quite a while.
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-1
kavih7 at yahoo dot com
5 years ago
For those of you who use this function (session_register that is), even though the manual does specify that this function implicitly calls session_start(), I just wanted to reiterate that fact. It is also important to know that if you ever switch from session_register to using $_SESSION, make sure to call session_start before adding items to the $_SESSION variable, because unlike session_register, no implicit call to session_start is done.

Another reason I explain this is because I ran into a problem in which you can add items to the $_SESSION variable all you want, but if session_start is not called before adding them, they will not actually be saved to the session. Using the same code, though, and replacing the $_SESSION assignments with session_register without calling session_start WILL save that info to the session.

It would be nice to have PHP check for writes to the $_SESSION variable and complain with a warning if session_start hasn't been called.
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-1
martijn at brothersinart dot net
8 years ago
Please note that if you use a "|" sign in a variable name your entire session will be cleared, so the example below will clear out all the contents of your session.

<?php
session_start
();
$_SESSION["foo|bar"] = "foo";
?>

It took me quite some time finding out why my session data kept disappearing. According to this bugreport this behaviour is intended.
http://bugs.php.net/bug.php?id=33786
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-1
Scarab
5 years ago
If you want to store an  object into the session, you have to check up that object can be serialized at all.
For example, if your object contains aggregated PDO object (which can't be serialized), you will get an error and no data would be stored.
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-1
tecnico at overant dot com
1 year ago
If you have many websites with these functions in the source code (like me) you can include the following functions in some kind of include.php that you have:

function session_register($session)
{
  //
}

function session_unregister($session)
{
  unset($_SESSION[$session]);
}

In this way the PHP interpreter detects the functions and do not return the error, and the maintenance work is minimized.
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-1
klein at sup4u dot de
3 years ago
in addition to function set_session_vars instead of replacing all $var with $_SESSION['var'],
you could get all set session-vars in prevoius scripts with this function

<?php
function get_session_vars() {
   
$nb_args=func_num_args();
   
$arg_list=func_get_args();
    for(
$i=0;$i<$nb_args;$i++) {
        global $
$arg_list[$i] = $_SESSION[$arg_list[$i]];
    }
}
?>
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-1
david dot demri at gmail dot com
5 years ago
If you have an old code with a lot of call to the function session_register(), and you would like to make it compatible with PHP5 or PHP6, instead of rewriting all your code by replacing this function by $_SESSION['var']="val"; you could use the function set_session_vars(), that is used exactly the same way than session_register() (but there is no implicit call to session_start() ).

<?php
function set_session_vars() {
   
$nb_args=func_num_args();
   
$arg_list=func_get_args();
    for(
$i=0;$i<$nb_args;$i++) {
        global $
$arg_list[$i];
       
$_SESSION[$arg_list[$i]] = $$arg_list[$i];
    }
}
?>
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-1
guideng at unlv dot nevada dot edu
8 years ago
Make sure you put session_start() at the beggining of your script.

My sessions kept unsetting and I finally figured out why.

On my script, session_start() has to be said and uses cookies to set the session.

But I was outputting html prior to calling session_start(), which prevented it from succeeding becouse it uses the header function to place the cookies.

Once html has been outputed, session_start() can't use the header function to set cookies, hence session_start() fails and no session can be started.
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-2
baldanders
10 years ago
If you are using sessions and use session_register()  to register objects, these objects are serialized automatically at the end of each PHP page, and are unserialized automatically on each of the following pages. This basically means that these objects can show up on any of your pages once they become part of your session.
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