Reverse number
A number can be written in reverse order.
For example
12345 = 54321Logic:
- 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
Below progrem shows digits reversal of 23456.
Example:
<?php
$num = 23456;
$revnum = 0;
while ($num > 1)
{
$rem = $num % 10;
$revnum = ($revnum * 10) + $rem;
$num = ($num / 10);
}
echo "Reverse number of 23456 is: $revnum";
?>
Output
Reversing Number With strrev () in PHP
Function strrev() can also be used to reverse the digits of 23456.
Example:
<?php
function reverse($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
