Help on adding digits

[d_r_sriram]

Hi Everybody-I have to implement a code that adds up 8 digits amongst itself till it doesnt get reduced to a single digit. for ex : i have to add 31031976 as 3+1+0+3+1+9+7+6=30=3+0=3.the input wud be always of 8 digits.can someone be kind enof to share the code..thanks in advance-Sriram

[genericnumber1]

I posted a solution to this a few weeks ago.

 

<?php
$number = 31031976;
while($number > 9) {
   $number = array_sum(str_split($number));
}
echo $number;

 

From: http://www.phpfreaks.com/forums/index.php/topic,247632.msg1158771.html#msg1158771