Credit Card Validation in PHP

Card.php

<?php
  class Card {
    public function getCCType($cardNumber) {
      // Remove non-digits from the number
      $cardNumber = preg_replace('/\D/', '', $cardNumber);

      // Validate the length
      $len = strlen($cardNumber);
      if ($len < 15 || $len > 16) {
          throw new Exception("Invalid credit card number. Length does not match");
      } else {
        switch($cardNumber) {
          case(preg_match ('/^4/', $cardNumber) >= 1):
              return 'Visa';
          case(preg_match ('/^5[1-5]/', $cardNumber) >= 1):
              return 'Mastercard';
          case(preg_match ('/^3[47]/', $cardNumber) >= 1):
              return 'Amex';
          case(preg_match ('/^3(?:0[0-5]|[68])/', $cardNumber) >= 1):
              return 'Diners Club';
          case(preg_match ('/^6(?:011|5)/', $cardNumber) >= 1):
              return 'Discover';
          case(preg_match ('/^(?:2131|1800|35\d{3})/', $cardNumber) >= 1):
              return 'JCB';
          default:
              throw new Exception("Could not determine the credit card type.");
              break;
          }
      }
	  }
    
    public function validateChecksum($number) {
	      // Remove non-digits from the number
	      $number=preg_replace('/\D/', '', $number);
	      // Get the string length and parity
	      $number_length = strlen($number);
	      $parity = $number_length % 2;
	      // Split up the number into single digits and get the total
	      $total=0;
	      for ($i=0; $i<$number_length; $i++) {
	          $digit=$number[$i];
	          // Multiply alternate digits by two
	          if ($i % 2 == $parity) {
	              $digit*=2;    
	              // If the sum is two digits, add them together
	              if ($digit > 9) {
	                  $digit-=9;
	              }
	          }    
	          // Sum up the digits
	          $total+=$digit;
	      }
	      // If the total mod 10 equals 0, the number is valid
	      return ($total % 10 == 0) ? TRUE : FALSE;
	    }
  }

$card = new Card();
echo $card->validateChecksum(xxxx-xxxx-xxxx-xxxx) // 1 or 0
echo $card->getCCType(xxxx-xxxx-xxxx-xxxx) // Visa, Mastercard, Amex, Diners, Discover, JCB