PHP - Manual: session_is_registered

2024-04-27

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session_is_registered

(PHP 4, PHP 5 < 5.4.0)

session_is_registered — 检查变量是否在会话中已经注册

说明

session_is_registered ( string $name ) : bool

检查变量是否已经在会话中注册。

Warning

本函数已自 PHP 5.3.0 起废弃并将自 PHP 5.4.0 起移除。

参数

name: 变量名称。

返回值

session_is_registered() 返回 TRUE 则表示 name 变量已经在当前会话中注册使用，否则返回 FALSE 。

注释

Note:
如果使用 $_SESSION (或 $HTTP_SESSION_VARS for PHP 4.0.6 or less),可以使用 isset() 检查变量是否在 $_SESSION 中注册使用。

Caution

如果使用 $_SESSION (或 $HTTP_SESSION_VARS), 则不要使用 session_register(), session_is_registered() 和 session_unregister().

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User Contributed Notes 9 notes

down

pk at majstar dot com ¶

4 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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amol_bhavsar1982 at hotmail dot com ¶

10 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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-12

someone at the dot inter dot net ¶

5 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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-13

paimpozhil at gmail dot com ¶

6 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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-8

miguel dot simoes at swirve dot com ¶

16 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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-13

someone at the dot inter dot net ¶

5 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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-14

vectorjohn at example dot com ¶

5 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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-21

Sami ¶

5 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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-20

CertaiN ¶

4 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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官方地址：https://www.php.net/manual/en/function.session-is-registered.php

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PHP官方手册 - 互联网笔记

session_is_registered

说明

参数

返回值

注释

User Contributed Notes 9 notes