If the element is in fact a group, it will be considered as a whole, an array of group elements' values will be passed to validation function. To validate grouped elements as separate entities, use addGroupRule().
Parameter
mixed $element
Form element name(s). Currently the only builtin rule that expects and correctly handles an array here is compare:
$form->addElement('password', 'cmpPasswd', 'Password:'); $form->addElement('password', 'cmpRepeat', 'Repeat password:'); $form->addRule(array('cmpPasswd', 'cmpRepeat'), 'The passwords do not match', 'compare', null, 'client');
All other builtin rules will only handle a single element name.
string $message
Message to display for invalid data
string $type
Rule type, use getRegisteredRules() to get types. You can also pass a classname for a descendant of HTML_QuickForm_Rule or an instance of such class.
string $format
(optional) Required for extra rule data
string $validation
(optional) Where to perform validation: "server", "client"
boolean $reset
For client-side validation: reset the form element to it's original value if there is an error?
boolean $force
Force the rule to be applied, even if the target form element does not exist
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