<?php function isbn_validateten($isbn) { #$isbn = str_replace(array(' ', '-'), '' $isbn); $chksum = substr($isbn, -1, 1); $isbn = substr($isbn, 0, -1); if (preg_match('/X/i', $chksum)) { $chksum="10"; } $sum = isbn_genchksum10($isbn); if ($chksum == $sum){ return 1; }else{ return 0; } } if(isbn_validateten($_GET['isbn'])) { header("Location: http://ad.zanox.com/ppc/?22806504C1206851698T&ULP=".$_GET['isbn']); } else { die('Fehlerhafte ISBN'); } ?>
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