PHP implements the principles of all types of credit card verification

This article mainly introduces the PHP implementation for verifying all types of credit card classes. It analyzes the implementation principles and related usage techniques of the credit card class with examples. It has certain reference value. Friends in need can refer to it

The example in this article describes the PHP implementation used to verify all types of credit card classes. Share it with everyone for your reference. The details are as follows:

This php class is relatively complete and can be used to verify various credit cards. It verifies the general rules of credit card numbers and also performs targeted identification of different types of credit cards.
The code accepts a credit card number and expiration date, and returns TRUE if both are valid, otherwise it returns FALSE.

This plug-in accepts the following parameters:
$number represents a string of credit card numbers
$expiry The credit card expiry date, in the format of 07/12 or 0712

<?php
// Plug-in 32: Validate Credit Card
// This is an executable example with additional code supplied
// To obtain just the plug-ins please click on the Download link
$card  = "4567 1234 5678 9101";
$exp  = "06/11";
echo "Validating: $card : $exp<br>";
$result = PIPHP_ValidateCC($card, $exp);
if ($result != FALSE) echo "Card Validated";
else echo "Card did not validate";
function PIPHP_ValidateCC($number, $expiry)
{
  // Plug-in 32: Validate Credit Card
  //
  // This plug-in accepts a credit card number and
  // an expiry date and returns TRUE or FALSE,
  // depending on whether the details pass date
  // and checksum validation. The arguments required
  // are:
  //
  //  $number: Credit Card Number
  //  $expiry: Expiry date in the form:
  //    07/12 or 0712 (for July, 2012)
  $number = preg_replace(&#39;/[^\d]/&#39;, &#39;&#39;, $number);
  $expiry = preg_replace(&#39;/[^\d]/&#39;, &#39;&#39;, $expiry);
  $left  = substr($number, 0, 4);
  $cclen = strlen($number);
  $chksum = 0;
  // Diners Club
  if (($left >= 3000) && ($left <= 3059) ||
    ($left >= 3600) && ($left <= 3699) ||
    ($left >= 3800) && ($left <= 3889))
   if ($cclen != 14) return FALSE;
  // JCB
  if (($left >= 3088) && ($left <= 3094) ||
    ($left >= 3096) && ($left <= 3102) ||
    ($left >= 3112) && ($left <= 3120) ||
    ($left >= 3158) && ($left <= 3159) ||
    ($left >= 3337) && ($left <= 3349) ||
    ($left >= 3528) && ($left <= 3589))
   if ($cclen != 16) return FALSE;
  // American Express
  elseif (($left >= 3400) && ($left <= 3499) ||
      ($left >= 3700) && ($left <= 3799))
   if ($cclen != 15) return FALSE;
  // Carte Blanche
  elseif (($left >= 3890) && ($left <= 3899))
   if ($cclen != 14) return FALSE;
  // Visa
  elseif (($left >= 4000) && ($left <= 4999))
   if ($cclen != 13 && $cclen != 16) return FALSE;
  // MasterCard
  elseif (($left >= 5100) && ($left <= 5599))
   if ($cclen != 16) return FALSE;
  // Australian BankCard
  elseif ($left == 5610)
   if ($cclen != 16) return FALSE;
  // Discover
  elseif ($left == 6011)
   if ($cclen != 16) return FALSE;
  // Unknown
  else return FALSE;
  for ($j = 1 - ($cclen % 2); $j < $cclen; $j += 2)
   $chksum += substr($number, $j, 1);
  for ($j = $cclen % 2; $j < $cclen; $j += 2)
  {
   $d = substr($number, $j, 1) * 2;
   $chksum += $d < 10 ? $d : $d - 9;
  }
  if ($chksum % 10 != 0) return FALSE;
  if (mktime(0, 0, 0, substr($expiry, 0, 2), date("t"),
   substr($expiry, 2, 2)) < time()) return FALSE;
  return TRUE;
}
?>

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

Related recommendations:

Definition and usage of curl_setopt function in PHP

##Brief description of PHP query database to return json data

Brief description of PHP classes for operating mysql database

The above is the detailed content of PHP implements the principles of all types of credit card verification. For more information, please follow other related articles on the PHP Chinese website!