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PHP Basic

 Introduction to PHP  PHP Starting Requirements  Downloading XAMPP Local Server  PHP Variable Concept and Data Type  PHP Coding Syntax  Showing Output in PHP  PHP String Concatenation  Increment & Decrement in PHP  PHP Logical Operator and Usage Part-1  PHP Logical Operator and Usage Part-2  PHP Comparison Operators  Arithmetic and Assignment Operators  PHP Switch Case Statement  For loop in PHP  Super Global Variable  $_REQUEST and $_GET Part-1  String Length in PHP  Function Declaration and Usage

Super Global Variable


In php there eight variables. These eight variables are fixed, constant and can't be changed. This variable is started with $_. For several reasons, they are known as super global variables. Different variables have different duty to do. Some works with file, some works with request and some works to send data to sever. Let’s see the below table for better clearance.

Syntax Usage
$_FILES Works with File(Upload, Check Type)
$_GET Receives Data
$_POST Sends Data to Server
$_REQUEST Responds to The Request
$_SESSION Set Session for User Access
$_COOKIE Set Cookie for User Identification
$_SERVER Request Server and Get Server Info
$_ENV  

$_ENV is used not so much but has usage also.