Get the sum of digits in PHP

Question

How do I find the sum of all the digits in a number in PHP? I've found solutions for C# and others, but not PHP. How do I do it? Thanks!

Answer 1

array_sum(str_split($number));

This assumes the number is positive (or, more accurately, that the conversion of $number into a string generates only digits).

Answer 2

Another way, not so fast, not single line simple

<?php

    $n = 123;
    $nstr = $n . "";

    $sum = 0;
    for ($i = 0; $i < strlen($nstr); ++$i)
    {
        $sum += $nstr[$i];
    }
    echo $sum;

?>

It also assumes the number is positive.

Answer 3

Artefactos method is obviously unbeatable, but here an version how one could do it "manually":

$number = 1234567890;
$sum = 0;
do {
    $sum += $number % 10;
}
while ($number = (int) $number / 10);

This is actually faster than Artefactos method (at least for 1234567890), because it saves two function calls.