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From: "J.O. Aho" <user@example.net>
Newsgroups: comp.lang.php
Subject: Re: Competition.
Date: Thu, 14 Jan 2021 18:21:02 +0100
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On 14/01/2021 14.03, Arno Welzel wrote:
> Y A:
> 
>> Arno Welzel kirjutas esmaspäev, 11. jaanuar 2021 kl 02:54:38 UTC+2:
>>> I I:
>>>> Who will post the cross sum of following number first, will get an adorable reward from me.
>>>>
>>>> The number:
>>>> 58349863148967341986793418678943167894317568943579812347643263461438776834177468314765864533703574653715456716465804656089576907569568456680257542768434686845796847604780607596864802468874265807426587026578406466539046579467684906749046758049663588463065836688638658768635806365889683658746862486247487652774625076485806648907696785970467957869053868763688046236880752825686569877668097860897676807746897456368844688745768468242622686282862869874986865749685796854096857706759759674569074359357697539375903576096780074367589368590356896686539
>>> 2977
>>>
>>> And - what's the award?
>>>
>>>
>>> -- 
>>> Arno Welzel
>>> https://arnowelzel.de
>>
>> This is not the number, that I have on my paper.
> 
> Then your number is wrong. 2977 is the cross sum of all digits above:
> 
> <?php
> 
> $value =
> '58349863148967341986793418678943167894317568943579812347643263461438776834177468314765864533703574653715456716465804656089576907569568456680257542768434686845796847604780607596864802468874265807426587026578406466539046579467684906749046758049663588463065836688638658768635806365889683658746862486247487652774625076485806648907696785970467957869053868763688046236880752825686569877668097860897676807746897456368844688745768468242622686282862869874986865749685796854096857706759759674569074359357697539375903576096780074367589368590356896686539';
> 
> $n = 0;
> for($i=0; $i<strlen($value); $i++) {
> 	$n+=(int)substr($value, $i, 1);
> }
> 
> echo $n;

if you want cleaner looking code in the for loop

  $n+=(int)$value[$i];


or use this, of course I think it will use up more memory but a bit 
cleaner look.


foreach(str_split($value) as $c)
{
         $n += (int)$c;
}


-- 

  //Aho