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Created: March 25th 2021
Last updated: March 25th 2021
Categories: IT Development, Php
Author: Miljan Puzovic
Last updated: March 25th 2021
Categories: IT Development, Php
Author: Miljan Puzovic
PHP Function for generating check digits (for ESR-numbers) for orange Swiss payment slips ("Oranger Einzahlungsschein")
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This is an algorithm used to create check digits. It's based on recursive usage of Modulo10.
Creating a check digit (algorithm)
Here is a PHP function which can be used to create check digit from any numerical string:
function get_check_digit($input) {
$input = trim($input);
if (ctype_digit(strval($input)) === false && is_string() === false)
return "ERROR: input must be an integer sent as a string. Example: not 1234 or 1234.5 but '1234'!";
$arrayTable = [0,9,4,6,8,2,7,1,3,5];
$carry = 0;
for ($i = 0; $i < strlen($input); $i++) {
$carry = $arrayTable[($carry + substr($input, $i, 1)) % 10];
}
return (10 - $carry) % 10;
}