[NuAlpha]

Here is a minor update to take care of a problem with Canadian zip code validation...

<?php
#########################################
##      ## Validate Zipcode ##         ##
#########################################
## Version: 1.2.8 (3/2/2004)
## Last updated: 2/7/2005

if (!defined('XCART_SESSION_START')) { header('Location: ../'); exit('Access Denied!'); }

function validate_zipcode($zipcode,$country='') {
	
	$zipcode = trim($zipcode); // Prep by removing excess spaces.
	
	switch ($country) {
	case 'US': // Validate United States postal codes.
		if (strlen($zipcode) > 5 && strlen($zipcode) <= 10) { // If not length 5, then check for valid format.
			if (preg_match('/^([0-9]{5})([-=._\/\ ])?([0-9]{4})?$/', $zipcode, $checkZip)) {
				if (!empty($checkZip[3])) { // Is it a zip+4 code?
					if (empty($checkZip[2]) || $checkZip[2] != '-')
						$checkZip[2] = '-'; // Ensure that a dash is present in 9 digit zip code.
					$zipcode = $checkZip[1].$checkZip[2].$checkZip[3];
				} else // Cause an error from incorrect length.
					$zipcode = '';
			} else // No valid zip code matched.
				$zipcode = '';
		} elseif (strlen($zipcode) < 5 || preg_match('/[[:alpha:]]/i',$zipcode)) // Check min length or presence of a letter.
			$zipcode = '';
		# If none of the above, do not modify zipcode. It is a valid 5 numeric digits.
		break;
	case 'CA': // Validate Canadian postal codes.
		if (strlen($zipcode) >= 6 && strlen($zipcode) <= 7) { // Check for valid length.
			if (preg_match('/^([A-z0-9]{3})([-._\/\ ]?)([A-z0-9]{3})$/i', $zipcode, $checkZip)) {
				if ($checkZip[2] != ' ')
					$checkZip[2] = ' '; // Ensure that a space is between the two code segments.
				$zipcode = $checkZip[1].$checkZip[2].$checkZip[3];
			} else // Cause an error from incorrect length.
				$zipcode = '';
		} else // No valid zip code matched.
			$zipcode = '';
		
		if (!empty($zipcode))
			$zipcode = strtoupper($zipcode); // Capitalize alphabetic characters for Canadian postal code.
		break;
	}
	
	return $zipcode;
}
?>