Task: IBAN
C++: #include <string>
#include <iostream>
#include <boost/algorithm/string.hpp>
#include <map>
#include <algorithm>
#include <cctype>

using namespace boost::algorithm;

bool isValid(const std::string &ibanstring) {
    static std::map<std::string, int> countrycodes {
        {"AL", 28}, {"AD", 24}, {"AT", 20}, {"AZ", 28 },
        {"BE", 16}, {"BH", 22}, {"BA", 20}, {"BR", 29 },
        {"BG", 22}, {"CR", 21}, {"HR", 21}, {"CY", 28 },
        {"CZ", 24}, {"DK", 18}, {"DO", 28}, {"EE", 20 },
        {"FO", 18}, {"FI", 18}, {"FR", 27}, {"GE", 22 },
        {"DE", 22}, {"GI", 23}, {"GR", 27}, {"GL", 18 },
        {"GT", 28}, {"HU", 28}, {"IS", 26}, {"IE", 22 },
        {"IL", 23}, {"IT", 27}, {"KZ", 20}, {"KW", 30 },
        {"LV", 21}, {"LB", 28}, {"LI", 21}, {"LT", 20 },
        {"LU", 20}, {"MK", 19}, {"MT", 31}, {"MR", 27 },
        {"MU", 30}, {"MC", 27}, {"MD", 24}, {"ME", 22 },
        {"NL", 18}, {"NO", 15}, {"PK", 24}, {"PS", 29 },
        {"PL", 28}, {"PT", 25}, {"RO", 24}, {"SM", 27 },
        {"SA", 24}, {"RS", 22}, {"SK", 24}, {"SI", 19 },
        {"ES", 24}, {"SE", 24}, {"CH", 21}, {"TN", 24 },
        {"TR", 26}, {"AE", 23}, {"GB", 22}, {"VG", 24 }
    };
    std::string teststring(ibanstring);
    erase_all(teststring, " "); 
    if (countrycodes.find(teststring.substr(0, 2)) == countrycodes.end())
        return false;
    if (teststring.length() != countrycodes[teststring.substr(0, 2)])
        return false;
    if (!all(teststring, is_alnum()))
        return false;
    to_upper(teststring);
    std::rotate(teststring.begin(), teststring.begin() + 4, teststring.end());

    std::string numberstring; 
    for (const auto &c : teststring) {
        if (std::isdigit(c))
            numberstring += c;
        if (std::isupper(c))
            numberstring += std::to_string(static_cast<int>(c) - 55);
    }
    
    
    
    int segstart = 0;
    int step = 9;
    std::string prepended;
    long number = 0;
    while (segstart < numberstring.length() - step) {
        number = std::stol(prepended + numberstring.substr(segstart, step));
        int remainder = number % 97;
        prepended = std::to_string(remainder);
        if (remainder < 10)
            prepended = "0" + prepended;
        segstart = segstart + step;
        step = 7;
    }
    number = std::stol(prepended + numberstring.substr(segstart));
    return (number % 97 == 1);
}

void SayValidity(const std::string &iban) {
    std::cout << iban << (isValid(iban) ? " is " : " is not ") << "valid\n";
}

int main() {
    SayValidity("GB82 WEST 1234 5698 7654 32");
    SayValidity("GB82TEST12345698765432");
    return 0;
}

PHP: <?php 

function piece_wise($iban_all_digits) {
    
    $remainder = NULL;
    $slice = 9;
    
    for ($i=0; $i<strlen($iban_all_digits); $i=$i+$slice)
    {
        if ($i>0)
        {
            $slice = 7;
        } 
        
        $part = $remainder . substr($iban_all_digits, $i, $slice);


        $remainder = intval($part) % 97;
    }

return $remainder;

}


$iban = "GB82 WEST 1234 5698 7654 32";

$iban = str_replace(' ', '', $iban); 

$iban_length = strlen($iban);
$country_code = substr($iban, 0, 2);


$lengths = ['GB' => 22];


if ($lengths[$country_code] != $iban_length) 
{ 
    exit ("IBAN length not valid for $country_code");
}

$iban = substr($iban, 4) . substr($iban, 0, 4);



$iban_arr = str_split($iban, 1);


$iban_all_digits = '';

foreach ($iban_arr as $key=>$value)
{
    if (ctype_alpha($value)) 
    {
        $value = ord($value) - 55;
    }
    $iban_all_digits = $iban_all_digits . $value;
}


if (piece_wise($iban_all_digits) === 1) 
{
    echo "VALID IBAN!";
}

else 
{
    echo "IBAN NOT VALID";
}