## Swapping two numbers

There are two methods for swapping:
• By using third variable.
• Without using third variable.
Swapping Using Third Variable
				
<?php $a = 50;$b = 83;
echo "Before swapping:<br><br>";
echo "a =".$a." b=".$b."<br> ";
$third =$a;
$a =$b;
$b =$third;
echo "After swapping:<br><br>";
echo "a =".$a." b=".$b;
?> Swapping Without using Third Variable
Swap two numbers without using a third variable is done in two ways:

• Using arithmetic operation + and
• Using arithmetic operation * and
• Using arithmetic operation + and –
				
<?php
$a=567;$b=789;
echo " Before Swapping:<br>";
echo "Value of a: $a</br>"; echo "Value of b:$b</br>";
$a=$a+$b;$b=$a-$b;
$a=$a-$b; echo " After Swapping:<br>"; echo "Value of a:$a</br>";
echo "Value of b: $b</br>"; ?> Using arithmetic operation * and /   <?php$a=890;
$b=908; echo " Before Swapping:<br>"; echo "Value of a:$a</br>";
echo "Value of b: $b</br>";$a=$a*$b;
$b=$a/$b;$a=$a/$b;
echo " After Swapping:<br>";
echo "Value of a: $a</br>"; echo "Value of b:$b</br>"; ?> 