Reverse number

A number can be written in reverse order.

For example

12345 = 54321

Logic:

Declare a variable to store reverse number and initialize it with 0.
Multiply the reverse number by 10, add the remainder which comes after dividing the number by 10.

Reversing Number in PHP

Example:

Below progrem shows digits reversal of 23456.

<?php
$num = 23456;
$revnum = 0;
while ($num > 1)
{
$rem = $num % 10;
$revnum = ($revnum * 10) + $rem;
$num = ($num / 10); 
}
echo "Reverse number of 23456 is: $revnum";
?>

Output:

Reversing Number With strrev () in PHP

Example:

Function strrev() can also be used to reverse the digits of 23456.

<?php
function reverse($number)
{
   /* writes number into string. */
    $num = (string) $number;
    /* Reverse the string. */
    $revstr = strrev($num);
    /* writes string into int. */
    $reverse = (int) $revstr; 
     return $reverse;
}
 echo reverse(23456);
?>

Output:/strong>