Question

can we create validation rules, which can work as a core validation rule.

Suppose I want to use a validation function which can be use for input fields.Means I have a function like:

function checkinput($input)
   {
     $arr=array('x','y','z');
     if(in_array($input,$arr))
        return false;
     else
        return true;
   }

Now I want to use this function as the validation in all models. suppose for this function a custom rule has been created, name checkinput.
I want to use this validation in any model as:

var $validate = array(
   'name' => array(
        'notempty' => array(
            'rule' => 'notEmpty',
            'message' => 'Please provide a name.',
        ),
        'checkinput' => array(
            'rule' => 'checkinput',
            'message' => "You can't use X,Y,Z as name.",
        ),
    ));

Can this kind of custom validation rule be created in behaviour or by other method..

Answer 1

This should help you: “Custom validation rules”
http://www.dereuromark.de/2010/07/19/extended-core-validation-rules/

and
http://www.dereuromark.de/2011/10/07/maximum-power-for-your-validation-rules/
with code in github

Note that you need to array_shift first (see debug output for details):

function validateCustom($field) {
    $field = array_shift($field);
    ....
}