Sum of string

[rashmi_k28]

Hi,

 

How to sum the numbers in string.

 

For example:

$number = 58;

I have to add the 5+8 which is equal to 13. And I have to add further and get the value 4.

How can I do this

[genericnumber1]

Easiest way?

 

<?php
$number = 58;
while($number > 9) {
$number = array_sum(str_split($number));
}
echo $number;

 

That's the easiest way, but it may never terminate under some circumstances

[ratcateme]

$number = 58;
while(strlen($number)!= 1){
    $numbers = str_split($number);
    $number = 0;
    foreach($numbers as $add){
        $number+=$add;
    }
}
echo $number;

 

Scott.

edit: guess i was beaten and with a better solution.

may never terminate? i can't think of a way off the top of my head for that?

 

[ratcateme]

a quick observation about that math behind this

this will also work

$number = 58;
$number = $number%9;
if($number == 0){
    $number = 9;
}

only problem is if the original number is 0 it outputs 9

so might need another if if you are planning on using it with numbers including 9

 

Scott.

[rashmi_k28]

Thanks for the quick reply.

 

How to pass different variables from different functions to get the number

$sum1 = get_number($number);

 

$bnum=get_number($split_date[0]);

 

[ratcateme]

you could go say

function get_number($number){
    while($number > 9) {
        $number = array_sum(str_split($number));
    }
    return $number;
}
$sum1 = get_number($number);

$bnum=get_number($split_date[0]);

 

Scott.