PHP program to demonstrate the use of $GLOBALS to access global variables

<?php
//PHP program to demonstrate the use of 
//$GLOBALS to access global variables.

$num = 30;

function sumNumber()
{
    $num = 20;
    $res = 0;

    $res = $GLOBALS['num'] + $num;
    return $res;
}

printf("Sum is: %d<br>", sumNumber());
?>

Output
Sum is: 50