<?php
$num = 20202021;
$sum=0; $rem=0;
for ($i =0; $i<=strlen($num);$i++)
{
$rem=$num%10;
$sum = $sum + $rem;
$num=$num/10;
}
echo "Sum of digits 20202021 is $sum";
?>Write a PHP Program to Print Sum of Digits.
Sum of Digit Numbers Using PHP Program, How to Sum of Digit by PHP, Print Sum of Digits Number in PHP Program
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