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This checks whether the data is a valid email address. Passing a boolean true as the second parameter for this rule will also attempt to verify that the host for the address is valid.

var $validate = array('email' => array('rule' => 'email'));
 
var $validate = array(
    'email' => array(
        'rule' => array('email', true),
        'message' => 'Please supply a valid email address.'
    )
);

1. var $validate = array('email' => array('rule' => 'email'));
3. var $validate = array(
4. 'email' => array(
5. 'rule' => array('email', true),
6. 'message' => 'Please supply a valid email address.'
7. )
8. );