RE: [PHP] Problem with HUGE floating values and fmod

THANKS! That did the trick. For future reference to all people needing to calculate check digits with ISO 7604 (MOD 97-10) method: $check=98-bcmod(($num."00"),97); The ."00" part is imporant... If $num was multiplied by 100 we wouldn't get a correct value in bcmod. Marco Almeida Project Manager WEBDADOS Tecnologias de Informação Telef.: +351 21 466 93 00 Fax: +351 21 466 42 81 Móvel: +351 96 324 43 44 Email: marcoalmeida@webdados.pt www: http://www.webdados.pt Morada: R. 9 de Abril, 3-3A, Sala 4 2765-545 S. Pedro do Estoril -----Original Message----- From: Curt Zirzow [mailto:czirzow@gmail.com] Sent: sexta-feira, 17 de Fevereiro de 2006 20:40 To: php-general@lists.php.net; marcoalmeida@webdados.pt Subject: Re: [PHP] Problem with HUGE floating values and fmod On Fri, Feb 17, 2006 at 06:48:13PM -0000, Marco Almeida wrote: > Hi there, > > I'm trying to calculate check digits for a payment system, using the > ISO > 7064 (MOD 97-10) algorithm, wich is, already translated to PHP: > > $check=98-fmod(($num*100),97); > > Where $num is a huge number... > > Example: 90150123123400043211 should have check digit 51 In windows > calculator: 98 - ( (90150123123400043211 * 100) mod 97) works OK and I > get 51 as result > > In PHP I get 13... You will need to use GMP or BCMath to do math operations numbers that size. See: http://php.net/language.types.integer.php Curt. -- cat .signature: No such file or directory