Validating Credit Card Function

This little function helps validating a given credit card number is legit:

function ValidateCreditCardNumber($cc_num)
{
  $pattern = "/^3[47]\d{13}$/";//American Express
  if (preg_match($pattern,$cc_num))
  {
    return true;
  }

  $pattern = "/^([30|36|38]{2})([0-9]{12})$/";//Diner's Club
  if (preg_match($pattern,$cc_num))
  {
    return true;
  }

  $pattern = "/^6011\d{12}$/";//Discover Card
  if (preg_match($pattern,$cc_num))
  {
    return true;
  }

  $pattern = "/^5[12345]\d{14}$/";//Mastercard
  if (preg_match($pattern,$cc_num))
  {
    return true;
  }
 
  $pattern = "/^4\d{12}(\d\d\d){0,1}$/";//Visa
  if (preg_match($pattern,$cc_num))
  {
    return true;
  }

  $pattern = "/^30[012345]\d{11}$/";//Diners
  if (preg_match($pattern,$cc_num))
  {
    return true;
  }

  $pattern = "/^3[68]\d{12}$/";//Diners #2
  if (preg_match($pattern,$cc_num))
  {
    return true;
  }

  // Not valid
  return false;
}



-By Parthiv Patel

Parthiv Patel

Bhaishri Info Solution

Sr. PHP Developer

Limdi Chowk, AT PO. Nar, Di. Anand

Nar, Gujarat

388150

India

pparthiv2412@gmail.com

7383343029

DOB: 12/24/1986