The difference between register_globals parameter OFF and ON in PHP (detailed explanation of register_globals usage)_PHP Tutorial

The value of register_globals can be set to: On or Off. Let’s give a piece of code to describe their differences respectively.
Code:

Copy code The code is as follows:

When register_globals=Off, the next program receives You should use $_GET['user_name'] and $_GET['user_pass'] to accept the passed value. (Note: When the method attribute of

is post, you should use $_POST['user_name'] and $_POST['user_pass'])

When register_globals=On, the next program can Use $user_name and $user_pass directly to accept values.

As the name suggests, register_globals means to register as a global variable, so when it is On, the passed value will be directly registered as a global variable and used directly, and when it is Off, we need to go to a specific array Go get it. Therefore, friends who encounter the above problems of not being able to get the value should first check whether your register_globals setting matches your method of obtaining the value. (To view, you can use the phpinfo() function or directly view php.ini)

Then why do we use Off? There are 2 reasons:
1. New versions of PHP will use Off by default. Although you can set it to On, when you cannot control the server, the compatibility of your code becomes a big problem, so, You'd better start programming in the Off style from now on
2. Here are two articles explaining why you should use Off instead of On

http://www.php.net/manual/en/ security.registerglobals.php

Now there is another question: what to do with the large number of scripts written in the On style?
If your previous script was planned well and there is a public include file, such as config.inc.php, add the following code to this file to simulate it.
Code:

Copy code The code is as follows:

if ( !ini_get(' register_globals') )
{
extract($_POST);
extract($_GET);
extract($_SERVER);
extract($_FILES);
extract($ _ENV);
extract($_COOKIE);

if ( isset($_SESSION) )
{
extract($_SESSION);
}
}
?>

register_globals = Off not only affects how to obtain the data passed from , url, but also affects session and cookie. Correspondingly, getting session and cookie The method should be: $_SESSION[], $_COOKIE. At the same time, there are some changes in session handling. For example, session_register() is unnecessary and invalid. For specific changes, please check the Session handling functions in the php manual

The content in the middle of $_REQUEST actually comes from $_GET $_POST $_COOKIE, the disadvantage is that it is impossible to determine whether the variable comes from get post or cookie, so it is not suitable for occasions with strict requirements.

http://www.bkjia.com/PHPjc/325030.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/325030.htmlTechArticleThe value of register_globals can be set to: On or Off. Let’s give a piece of code to describe their differences respectively. Code: Copy code The code is as follows: form name="frmTest" id="frmTest" act...