 <?php
 
function add() {
  $a = 10;
  $b = 20;
  $sum = $a + $b;
}
 
add();
echo $sum;

	<?php

	function add() {
	$a = 10;
	$b = 20;
	$sum = $a + $b;
	}

	add();
	echo $sum;