This module provides a function to validate postal codes and ZIP codes for various countries. It has no user interface of its own, but can be used by other modules.

The main function is postal_code_validation_validate(string $postal_code, string $country). $postal_code is the postal code or ZIP code that you are validating. $country is the country that the code is from. The country can be omitted; if it is not there, the function will try to figure out what country the postal code is from.

The function returns an array with these elements:

country
Country code of the postal code.
country_supported
boolean, whether the country is supported.
province
The province or province code if it can be determined.
postal_code
The formatted postal code.
postal_code_changed
boolean, whether postal_code is different from the value sent in for validation.
error
An error message if the code is invalid.

Each is set to FALSE if a valid response is not possible.

In some cases, the country returned will be different from the one sent in. For example, if you search for a ZIP code with country "US", but that ZIP code is located in the US Virgin Islands, the country returned will be "VI".

Countries are always specified with the ISO 3166-1 alpha-2 country code, such as US, GB, and CA.

The module also provides the function postal_code_validation_get_dependencies() which returns an array of countries which use the postal code system of another country.

Drupal 6 Version

If you want to use this in Drupal 6, install the Drupal 7 version and edit the file postal_code_validation.info, changing:
core = 7.x
to:
core = 6.x

Supporting organizations: 

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