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Diese PHP Funktion validiert einen Iban Code

function ValidIban($value) {
$iban = false;
$value= strtoupper(trim($value));
# Change US text into your country code
if(preg_match('/^USd{7}0[A-Z0-9]{16}$/', $value)) {
$number= substr($value,4,22).'2927'.substr($value,2,2);
$number= str_replace(
array('A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'),
array(10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35),
$number
);
// Iban var -
$iban = (1 == bcmod($number,97)) ? true:false;
}
// Return to print
return $iban;
}[/php]
Quelle: phpsnips.com