Swapping two numbers in Php

Swapping Using Third Variable

Swap two numbers 45 and 78 using a third variable.

Example:

<?php  
$a = 45;  
$b = 78;  
// Swapping Logic  
$third = $a;  
$a = $b;  
$b = $third;  
echo "After swapping:<br><br>";  
echo "a =".$a."  b=".$b;  
?>  

Output:

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 /

Example for (+ and -):

<?php  
$a=234;  
$b=345;  
//using arithmetic operation  
$a=$a+$b;  
$b=$a-$b;  
$a=$a-$b;  
echo "Value of a: $a</br>";  
echo "Value of b: $b</br>";  
?>  

Output:

Example for (* and /):

<?php  
$a=234;  
$b=345;  
// using arithmetic operation  
$a=$a*$b;  
$b=$a/$b;  
$a=$a/$b;  
echo "Value of a: $a</br>";  
echo "Value of b: $b</br>";  
?>  

Output: