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Pastable version of ISBN10 to ISBN13

<pre class='prettyprint' language='php'>function isbn10_to_13($isbnold){ if (strlen($isbnold) != 10){ // Make sure we have a 10 digit string to start return 'Invalid ISBN-10, must be 10 digits'; } // prefix with 978 and drop old checksum (last digit) $isbn = '978'.substr($isbnold,0,9); for ($i = 0; $i &lt;= 12; $i++){ // For each digit if new isbn $weight = ($i%2 == 0)? 1 : 3; // Alternate between 1's and 3's $check_sum_total = $check_sum_total + ($isbn{$i} * $weight); // multiply each digit by 1 or 3 and add to $checksumtotal } $new_check_sum = 10 - ($check_sum_total%10); // Modulus 10 business return ($isbn.$new_check_sum); //add checksum on to end and return }</pre> <a href="http://www.refactormycode.com/codes/33-isbn10-to-isbn13" style="color:#fff" title="As seen on RefactorMyCode.com"><img alt="Small_logo" src="http://www.refactormycode.com/images/small_logo.gif" style="border:0" /></a>