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This rule ensures that the data meets a minimum length requirement.

var $validate = array(
    'login' => array(
        'rule' => array('minLength', 8),  
        'message' => 'Usernames must be at least 8 characters long.'
    )
);

1. var $validate = array(
2. 'login' => array(
3. 'rule' => array('minLength', 8),
4. 'message' => 'Usernames must be at least 8 characters long.'
5. )
6. );

The length here is "the number of bytes in the string representation of the data". Be careful that it may be larger than the number of characters when handling non-ASCII characters.