Reverse a Number in PHP

1. Introduction

Reversing a number means rearranging its digits in the opposite order. For example, reversing 1568 results in 8651.

2. PHP Code to Reverse a Number

$number = 1568;
$reversed = 0;

while ($number > 0) {
    $digit = $number % 10;
    $reversed = $reversed * 10 + $digit;
    $number = intdiv($number, 10);
}

echo $reversed;
    

3. Explanation

The code extracts the last digit using % 10 and appends it to the reversed number by multiplying the current reversed value by 10.