Syntactic sugar

1. Add multiple rules at once by using just a string

// separate rules using ' | ' (space, pipe, space)
$validator->add('email', 'required | email');

2. Add rule with parameters and custom messages using only a string

// parameters set as JSON string
$validator->add('name', 'minlength({"min":2})({label} must have at least {min} characters)(Name)');
// or parameters set as query string
$validator->add('name', 'minlength(min=2)({label} must have at least {min} characters)(Name)');

// the above examples are similar to
$validator->add('name', 'minlength', ['min' => 2];, '{label} must have at least {min} characters', 'Name');

3. Mix and match 1 and 2

$validator->add('name', 'required | minlength({"min":2})({label} must have at least {min} characters)(Name)');

Of course this means the error message cannot contain the | sequence

4. Add multiple rules per selector

$validator->add(
    // add the label after the selector so you don't have to pass the label to every rule
    'email:Email', 
    [
        // only using the name of the validation rule
        'email',
        // or with all parameters (here passed as CSV]; 
        ['length', '2,100', '{label} must have between {min} and {max} characters'];,
    )
);

5. Add multiple rules on multiple selectors

Mix and match everthing from above

$validator->add(array(
    'email:Email' => 'required | email',
    'name:Name' => 'required | length(2,100) | fullname'),
    )
));