Templess Swap from Etsy Interview

templess swap

<?php
// Given two variables with integer values assumed positive, swap the values without using
// a temp variable
function templessSwap($a, $b){
	print("Swapping the values without a temp variable...\n");
	print("The initial values are:\nA: $a\nB: $b\n");
	$a = $a ^ $b;
	$b = $a ^ $b;
	$a = $a ^ $b;
	print("The values after the swap are:\nA: $a\nB: $b\n\n");
}

// Just a few test calls to the swap method here
templessSwap(1,2);
templessSwap(2,1);
templessSwap(-1,-1);
templessSwap(3,7);
templessSwap(1000, 10358);
?>