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This rule checks for valid file extensions like .jpg or .png. Allow multiple extensions by passing them in array form.

var $validate = array(
    'image' => array(
        'rule' => array('extension', array('gif', 'jpeg', 'png', 'jpg')),
        'message' => 'Please supply a valid image.'
    )
);

1. var $validate = array(
2. 'image' => array(
3. 'rule' => array('extension', array('gif', 'jpeg', 'png', 'jpg')),
4. 'message' => 'Please supply a valid image.'
5. )
6. );