PHP generates card number based on credit card number rules

This article mainly introduces the method of randomly generating credit card numbers by PHP. It involves the skills of generating card numbers by PHP according to the rules of credit card numbers. It has certain reference value. Friends in need can refer to it.

The examples in this article are described How to randomly generate credit card numbers in PHP. The specific analysis is as follows:

This PHP code randomly generates credit card numbers according to the credit card number generation rules. It can be verified and is for learning reference only. Please do not use it for illegal purposes, otherwise you will be responsible for the consequences.

<?php
/*
PHP credit card number generator
Copyright (C) 2006 Graham King graham@darkcoding.net
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
$visaPrefixList[] = "4539";
$visaPrefixList[] = "4556";
$visaPrefixList[] = "4916";
$visaPrefixList[] = "4532";
$visaPrefixList[] = "4929";
$visaPrefixList[] = "40240071";
$visaPrefixList[] = "4485";
$visaPrefixList[] = "4716";
$visaPrefixList[] = "4";
$mastercardPrefixList[] = "51";
$mastercardPrefixList[] = "52";
$mastercardPrefixList[] = "53";
$mastercardPrefixList[] = "54";
$mastercardPrefixList[] = "55";
$amexPrefixList[] = "34";
$amexPrefixList[] = "37";
$discoverPrefixList[] = "6011";
$dinersPrefixList[] = "300";
$dinersPrefixList[] = "301";
$dinersPrefixList[] = "302";
$dinersPrefixList[] = "303";
$dinersPrefixList[] = "36";
$dinersPrefixList[] = "38";
$enRoutePrefixList[] = "2014";
$enRoutePrefixList[] = "2149";
$jcbPrefixList[] = "35";
$voyagerPrefixList[] = "8699";
/*
&#39;prefix&#39; is the start of the CC number as a string, any number of digits.
&#39;length&#39; is the length of the CC number to generate. Typically 13 or 16
*/
function completed_number($prefix, $length) {
  $ccnumber = $prefix;
  # generate digits
  while ( strlen($ccnumber) < ($length - 1) ) {
    $ccnumber .= rand(0,9);
  }
  # Calculate sum
  $sum = 0;
  $pos = 0;
  $reversedCCnumber = strrev( $ccnumber );
  while ( $pos < $length - 1 ) {
    $odd = $reversedCCnumber[ $pos ] * 2;
    if ( $odd > 9 ) {
      $odd -= 9;
    }
    $sum += $odd;
    if ( $pos != ($length - 2) ) {
      $sum += $reversedCCnumber[ $pos +1 ];
    }
    $pos += 2;
  }
  # Calculate check digit
  $checkdigit = (( floor($sum/10) + 1) * 10 - $sum) % 10;
  $ccnumber .= $checkdigit;
  return $ccnumber;
}
function credit_card_number($prefixList, $length, $howMany) {
  for ($i = 0; $i < $howMany; $i++) {
    $ccnumber = $prefixList[ array_rand($prefixList) ];
    $result[] = completed_number($ccnumber, $length);
  }
  return $result;
}
function output($title, $numbers) {
  $result[] = "<p class=&#39;creditCardNumbers&#39;>";
  $result[] = "<h3 id="title">$title</h3>";
  $result[] = implode(&#39;<br />&#39;, $numbers);
  $result[]= &#39;</p>&#39;;
  return implode(&#39;<br />&#39;, $result);
}
#
# Main
#
echo "<p class=&#39;creditCardSet&#39;>";
$mastercard = credit_card_number($mastercardPrefixList, 16, 10);
echo output("Mastercard", $mastercard);
$visa16 = credit_card_number($visaPrefixList, 16, 10);
echo output("VISA 16 digit", $visa16);
echo "</p>";
echo "<p class=&#39;creditCardSet&#39;>";
$visa13 = credit_card_number($visaPrefixList, 13, 5);
echo output("VISA 13 digit", $visa13);
$amex = credit_card_number($amexPrefixList, 15, 5);
echo output("American Express", $amex);
echo "</p>";
# Minor cards
echo "<p class=&#39;creditCardSet&#39;>";
$discover = credit_card_number($discoverPrefixList, 16, 3);
echo output("Discover", $discover);
$diners = credit_card_number($dinersPrefixList, 14, 3);
echo output("Diners Club", $diners);
echo "</p>";
echo "<p class=&#39;creditCardSet&#39;>";
$enRoute = credit_card_number($enRoutePrefixList, 15, 3);
echo output("enRoute", $enRoute);
$jcb = credit_card_number($jcbPrefixList, 16, 3);
echo output("JCB", $jcb);
echo "</p>";
echo "<p class=&#39;creditCardSet&#39;>";
$voyager = credit_card_number($voyagerPrefixList, 15, 3);
echo output("Voyager", $voyager);
echo "</p>";
?>

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