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Free Beginner PHP Tutorials - Global Functions and variables


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2016:09:26 / Science and Tutorials

Tutorial how to create Global Functions and variables in PHP to referenced inside a function





PHP Global Variables (Superglobals).


Note, Superglobals are variables available in all scopes and were introduced in PHP 4.1.0.

For this article, I will explain the two types of PHP superglobal variables.
-built-in global variables 
-user-defined global variables

PHP built-in global variables


These are predefined PHP variables (built-in) and are accessible from any function or class regardless of their scope.

Some of the PHP built-in global variables are:

$_SERVER
$_REQUEST
$_POST
$_GET
$_FILES
$_ENV
$_COOKIE
$_SESSION

user-defined global variables

These are user defined global variables which are declared as global from our function.
We use the keyword 'global' to declare our variables inside our function.

Example

<?php $x=20; $y=30; function findProduct(){  global $x, $y; $area = $x * $y; echo"Our product is: ".$area; } findProduct(); ?>

Output: Our product is: 600












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