PHP 7.1.0 Released

session_register

(PHP 4, PHP 5 < 5.4.0)

session_registerRegistra uma ou mais variáveis globais na sessão atual

Descrição

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

session_register() aceita um número de argumentos variáveis, alguns deles podem ser ou uma string com o nome da variável ou um array de nomes de variáveis ou outros arrays. Para cada nome, session_register() registra a variável global com o nome na sessão atual.

Você também pode criar uma variável de sessão simplesmente definindo o membro apropriado nos arrays $_SESSION ou $HTTP_SESSION_VARS (PHP < 4.1.0).

<?php
// O uso de session_register() está obsoleto
$barney "Um grande dinossauro roxo.";
session_register("barney");

// O uso de $_SESSION é preferível desde o PHP 4.1.0
$_SESSION["zim"] = "Um invasor de outro planeta.";

// O modo antigo era usando $HTTP_SESSION_VARS
$HTTP_SESSION_VARS["spongebob"] = "Ele tem uma calça quadrada.";
?>

Se session_start() não for chamada antes dessa função ser executada, uma chamada implícita a session_start(), sem parâmetros, será feita. $_SESSION não imita esse comportamento e requer session_start() antes de seu uso.

Aviso

Esta função tornou-se OBSOLETA desde o PHP 5.3.0 e foi REMOVIDA desde o PHP 5.4.0.

Parâmetros

name

Uma string contento o nome de uma variável ou array com nomes de variáveis ou ainda outros arrays.

...

Valor Retornado

Retorna TRUE em caso de sucesso ou FALSE em caso de falha.

Notas

Cuidado

Se você deseja que seu script funcione independente de register_globals, então o que deve ser usado é o array $_SESSION, pois entradas em $_SESSION são registrados automaticamente. Se o seu script utiliza session_register(), ele não vai funcionar em ambientes onde a diretava register_globals está desativada.

Nota: Nota importante sobre register_globals:

Desde o PHP 4.2.0, o valor padrão para a diretiva register_globals é off e foi completamente removida a partir do PHP 6.0.0. A comunidade do PHP desencoraja desenvolvedores a confiar nesta diretiva, e encoraja o uso de outros meios, como em superglobals.

Cuidado

Isto registra uma variável global. Se você deseja registrar uma variável de dentro de uma função, então é necessário torná-la global utilizando a keyword global ou o array $GLOBALS[], ou ainda utilizar os arrays especiais conforme abaixo.

Cuidado

Se você está utilizando $_SESSION (ou $HTTP_SESSION_VARS), então não use session_register(), session_is_registered() e session_unregister().

Nota:

Atualmente é impossível registrar variáveis de recursos (resource) em uma sessão. Por exemplo, você não pode criar uma conexão a um banco de dados e armazenar a conexão em uma variável de sessão e esperar que a conexão ainda esteja válida quando a sessão for restaurada. Funções do PHP que retornam um recurso (resource) são identificados pelo tipo resource em sua definição. Uma lista de funções que retornam recursos está disponível no apêndice Tipos de Recursos.

Se $_SESSION (ou $HTTP_SESSION_VARS para PHP 4.0.6 e anteriores) for utilizado, atribua valores para $_SESSION. Por exemplo: $_SESSION['var'] = 'ABC';

Veja Também

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User Contributed Notes 14 notes

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12
Ezion oudpapierdoos at gmail dot com
6 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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11
rob at akrabat dot com
7 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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2
david dot jufer at kirchenweb dot ch
3 months ago
This code replaces the removed function "session_register" for PHP >= 5.4.0
"session_start()" must be called before.

<?php

function session_register($name){
    if(isset(
$GLOBALS[$name])) $_SESSION[$name] = $GLOBALS[$name];
   
$GLOBALS[$name] = &$_SESSION[$name];
}

?>
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3
david dot demri at gmail dot com
7 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
dee dot earley at icode dot co dot uk
10 months ago
Something that hasn't really been touch on when migrating old code, is that changes to variables made AFTER the session_register() call are still included in the session state.
A lot of the implementations above only add the entry to $_SESSION[] at the point it's called.
If the old code relies on this behaviour, you will either need to have code called on exit to assign back to $_SESSION, or replace it in entirety with $_SESSION usage. With over 1000 uses of the session_ functions, this is a bit daunting!
up
0
yarco dot w at gmail dot com
6 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
12 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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0
baldanders
12 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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-1
Scarab
7 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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-2
tecnico at overant dot com
3 years 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
martijn at brothersinart dot net
10 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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-2
klein at sup4u dot de
5 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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-5
guideng at unlv dot nevada dot edu
10 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.
up
-5
kavih7 at yahoo dot com
7 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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