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The data for the field must be a boolean value. Valid values are true or false, integers 0 or 1 or strings '0' or '1'.

var $validate = array(
    'myCheckbox' => array(
        'rule' => array('boolean'),
        'message' => 'Incorrect value for myCheckbox'
    )
);

1. var $validate = array(
2. 'myCheckbox' => array(
3. 'rule' => array('boolean'),
4. 'message' => 'Incorrect value for myCheckbox'
5. )
6. );