<?php

$x = 10;

$y = 20;

echo “before swapping, number are: ”;

echo $x;

echo “        ”;

echo $y:

echo “\n”

/*swapping*/

$x = $x  + $y;

$y = $x  + $y;

$x = $x  + $y;

echo “<Br> After swapping, numbers are: ”;

echo $x;

echo “   ”

echo $y;

?>