What is the best way to validate a credit card in PHP?

<?
/* Luhn algorithm number checker - (c) 2005-2008 shaman - www.planzero.org *
 * This code has been released into the public domain, however please      *
 * give credit to the original author where possible.                      */

function luhn_check($number) {

  // Strip any non-digits (useful for credit card numbers with spaces and hyphens)
  $number=preg_replace('/D/', '', $number);

  // Set the string length and parity
  $number_length=strlen($number);
  $parity=$number_length % 2;

  // Loop through each digit and do the maths
  $total=0;
  for ($i=0; $i<$number_length; $i++) {
    $digit=$number[$i];
    // Multiply alternate digits by two
    if ($i % 2 == $parity) {
      $digit*=2;
      // If the sum is two digits, add them together (in effect)
      if ($digit > 9) {
        $digit-=9;
      }
    }
    // Total up the digits
    $total+=$digit;
  }

  // If the total mod 10 equals 0, the number is valid
  return ($total % 10 == 0) ? TRUE : FALSE;

}
?>

function check_cc($cc, $extra_check = false){
    $cards = array(
        "visa" => "(4d{12}(?:d{3})?)",
        "amex" => "(3[47]d{13})",
        "jcb" => "(35[2-8][89]ddd{10})",
        "maestro" => "((?:5020|5038|6304|6579|6761)d{12}(?:dd)?)",
        "solo" => "((?:6334|6767)d{12}(?:dd)?d?)",
        "mastercard" => "(5[1-5]d{14})",
        "switch" => "(?:(?:(?:4903|4905|4911|4936|6333|6759)d{12})|(?:(?:564182|633110)d{10})(dd)?d?)",
    );
    $names = array("Visa", "American Express", "JCB", "Maestro", "Solo", "Mastercard", "Switch");
    $matches = array();
    $pattern = "#^(?:".implode("|", $cards).")$#";
    $result = preg_match($pattern, str_replace(" ", "", $cc), $matches);
    if($extra_check && $result > 0){
        $result = (validatecard($cc))?1:0;
    }
    return ($result>0)?$names[sizeof($matches)-2]:false;
}

$cards = array(
    "4111 1111 1111 1111",
);

foreach($cards as $c){
    $check = check_cc($c, true);
    if($check!==false)
        echo $c." - ".$check;
    else
        echo "$c - Not a match";
    echo "<br/>";
}

4111 1111 1111 1111 - Visa

function validateCC($cc_num, $type) {

	if($type == "American") {
	$denum = "American Express";
	} elseif($type == "Dinners") {
	$denum = "Diner's Club";
	} elseif($type == "Discover") {
	$denum = "Discover";
	} elseif($type == "Master") {
	$denum = "Master Card";
	} elseif($type == "Visa") {
	$denum = "Visa";
	}

	if($type == "American") {
	$pattern = "/^([34|37]{2})([0-9]{13})$/";//American Express
	if (preg_match($pattern,$cc_num)) {
	$verified = true;
	} else {
	$verified = false;
	}


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


	} elseif($type == "Discover") {
	$pattern = "/^([6011]{4})([0-9]{12})$/";//Discover Card
	if (preg_match($pattern,$cc_num)) {
	$verified = true;
	} else {
	$verified = false;
	}


	} elseif($type == "Master") {
	$pattern = "/^([51|52|53|54|55]{2})([0-9]{14})$/";//Mastercard
	if (preg_match($pattern,$cc_num)) {
	$verified = true;
	} else {
	$verified = false;
	}


	} elseif($type == "Visa") {
	$pattern = "/^([4]{1})([0-9]{12,15})$/";//Visa
	if (preg_match($pattern,$cc_num)) {
	$verified = true;
	} else {
	$verified = false;
	}

	}

	if($verified == false) {
	//Do something here in case the validation fails
	echo "Credit card invalid. Please make sure that you entered a valid <em>" . $denum . "</em> credit card ";

	} else { //if it will pass...do something
	echo "Your <em>" . $denum . "</em> credit card is valid";
	}


}

echo validateCC("1738292928284637", "Dinners");