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Postal is used to validate ZIP codes from the U.S. (us), Canada (ca), U.K (uk), Italy (it), Germany (de) and Belgium (be). For other ZIP code formats, you may provide a regular expression as the second parameter.

var $validate = array(
    'zipcode' => array(
        'rule' => array('postal', null, 'us')
    )
);

1. var $validate = array(
2. 'zipcode' => array(
3. 'rule' => array('postal', null, 'us')
4. )
5. );