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PHP Global Variables

Global Variable

=> 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.

function add()
global $x,$y;
echo "sum of given no=".$sum;
function sub()
global $x,$y;
echo "subtraction of given no=".$sub;


Output Sum of given no = 300 Subtraction of given no = -100

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".