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Validate Credit Card Number

/ Published in: PHP
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  1. function fnValidateCc($mValue, $sCard = '')
  2. {
  3.   if ($sCard == 'visa')
  4.   {
  5.     $sPattern = '/^4([0-9]{12}|[0-9]{15})$/';
  6.   }
  7.   else if ($sCard == 'amex')
  8.   {
  9.     $sPattern = '/^3[4|7][0-9]{13}$/';
  10.   }
  11.   else if ($sCard == 'mastercard')
  12.   {
  13.     $sPattern = '/^5[1-5][0-9]{14}$/';
  14.   }
  15.   else if ($sCard == 'discover')
  16.   {
  17.     $sPattern = '/^6011[0-9]{12}$/';
  18.   }
  19.   else if ($sCard == 'dinners')
  20.   {
  21.     $sPattern = '/^[30|36|38]{2}[0-9]{12}$/';
  22.   }
  23.   else if (empty($sCard))
  24.   {
  25.     $sPattern = '/^[0-9]{13,19}$/';
  26.   }
  27.   else
  28.   {
  29.     return false;
  30.   }
  31.  
  32.   if (preg_match($sPattern, $mValue))
  33.   {
  34.     // Modulo 10 
  35.     $iSum = 0;
  36.     $iWeight = 2;
  37.     $iLength = strlen($mValue);
  38.  
  39.     for ($i = $iLength - 2; $i >= 0; $i--) 
  40.     {
  41.       $iDigit = $iWeight * $mValue[$i];
  42.       $iSum += floor($iDigit / 10) + $iDigit % 10;
  43.       $iWeight = $iWeight % 2 + 1;
  44.     }
  45.  
  46.     if ((10 - $iSum % 10) % 10 == $mValue[$iLength - 1]) 
  47.     {
  48.       return true;
  49.     }
  50.   }
  51.  
  52.   return false;
  53. }

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