flexrocks

So i have a pretty basic form validator that checks if the field is valid but i'm having hard time trying to implement rules. i have already implemented a few rules but how can i implement max_length and min_length? here is my validate function public function validate($field,$value,$rules) { $field = ucfirst($field); $rules = explode('|',$rules); foreach($rules as $rule) { switch($rule) { case 'required': $this->shouldBeRequired($field, $value); break; case 'string': $this->shouldBeString($field,$value); break; case 'email': $this->shouldBeEmail($field, $value); break; case 'number': $this->shouldBeNumber($field,$value); // default: // throw new ErrorException("$rule doesn't exist"); } } } i want to do case 'max_length' but i have no idea how. the rule should look like this max_length:60|required any help is appreciated