SuperGlobal Arrays In Php Tutorial

Wednesday, 20 March 2013

SuperGlobal Arrays In Php Tutorial

SuperGlobal Arrays In Php :

Php Arrays

There are predefined arrays variables in php. They are called SuperGlobal Arrays. It means that you can get their data in a web page at any place. And for using these arrays globally in the web page, there is no need to add the keyword globe in php. We will discuss arrays in coming tutorials. In this post we will be explaining SuperGlobal Arrays.

Types Of Super Global Arrays And Its Description :

Php SuperGlobal Arrays

Array	Description

$GLOBALS	It includes and consists of all global scope variables
$_SERVER	Data sent by HTTP Response to the server is foung in this address area. The data includes name of running page, name of server, Htto Version Number, Remote Ip Address etc.
S_GET	It consists of all querystring variables that are sent along with URL
$_POST	Field Area found in related page is stored in this area
$_COOKIE	It consists of all data of cookies which is sent to server by the client. It is saved on client machine is for of a file with cookies data. Users are identified with the help of cookies. For example, When you log in to Hotmail then you have to put your ID and Password in a form. This form has a check box which has written that “Remember me on this computer “. When you check this checkbox then your information will be stored in the cookie. Because of this you will not have to enter your email Id and Password again when you login next time in hotmail. Because your information will be automatically retrieved from Cookies.
$_FILES	When we upload any file with the help of Post Method then the information of this is stored in $_FILES Array.
$_SESSION	It includes all those variables that are made as the session variables.
$_REQUEST	It is a 3 in one array. It consists of $_POST, $_GET, $_COOKIES.

In the above table, we have listed superglobal variables. They might look difficult to understand, But actually they are very easy. You will be able to understand them very easily when we will be explaining them with the help of examples. Since it is not possible to explain all these in one post so we will be explaining in next post in detail.