lithium\security\auth\adapter\Form::$_validators

protected property

An array of callbacks, keyed by form field name, which make an assertion about a piece of submitted form data. Each validator should accept the value of the form field submitted (which will be modified by any applied filters), and return a boolean value indicating the success of the validation. If a validator is specified with no key, it will receive all form data and all database data. See the _validate() method for more information.

Source

	protected $_validators = [];