Home >>PHP Object Oriented >PHP Global Variables
=> Global variables are always initialize outside the function body.
=> Global variable work inside the function body as well as outside function body.
=> To access Global variable we have to use global keyword.
<?php $x=100; $y=200; function add() { global $x,$y; $sum=$x+$y; echo "sum of given no=".$sum; } function sub() { global $x,$y; $sub=$x-$y; echo "subtraction of given no=".$sub; } add(); sub(); ?>
In the above example There are two variables declare $x and $y outside the function body. Now if we want to call these global variable $x and $y inside add( ) and sub( ) function then used "global" keyword before the variable name like "global $x" and "global $y".