PHP Superglobals
Superglobals are variable that are automatically available throughout all program code,in all scopes. These variables require no declaration they can simply be accessed. Super global variables provide: Useful information about the environment Allow access to HTML form variables or parimeters Access to cookies stored on a client Keeping track of sessions and file uploads They are as follows: $_GET - $_GET is used for data passed using the HTTP GET method,which includes variables passed as part of the URL. For Example: www.designevlop.blogspot.com/index.php?book=PHP&cat=linux The GET method is conventionally used when the processing script has no lasting observable effect,such as changing a value in a database table. $_GET has been around since PHP 4.1.0 Before that,$HTTP_GET_VARS was used t