Swapping two numbers

Two numbers can be swapped or interchanged. It means first number will become second and second number will become first.

For example

a = 20, b = 30
After swapping,
a = 30, b = 20

There are two methods for swapping:

By using third variable.
Without using third variable.

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:

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Swapping two numbers

Swapping Using Third Variable

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