Get the sum of digits in PHP

Question

How do I find the sum of all the digits in a number in PHP?

Answer 1

// math before code 

// base of digit sums is 9 

// the product of all numbers multiplied by 9 equals 9 as digit sum

$nr = 58821.5712; // any number

// Initiallization 

$d = array();

$d = explode(".",$nr); // cut decimal digits

$fl = strlen($d[1]); // count decimal digits

$pow = pow(10 ,$fl); // power up for integer

$nr = $nr * $pow; // make float become integer

// The Code

$ds = $nr % 9; // modulo of 9 

if($ds == 0) $ds=9; // cancel out zeros

echo $ds;