Custom Validations

Introduction#

Yii2 has some built-in validators which can be used while solving programming related or general puprose validations. When you need to create a new business logic validation you need to create your own validators.

Types of Validations

Let’s initially understand basic types of custom validators:

1. Inline Validator
2. Standalone Validator

Inline Validator: It is the type of the validator we create inside the class which is basically a method we define just like other methods but with extra parameters which is passed in by Yii2.

....
public function ValidateMyBusiness($attr, $params){
    // adding an error here means our validation is failed.
    if ($this->{$attr} > 1100) {
        $this->addError($attr, "Some error occured");
    }
}
...
// calling above validator is simple as below:
public function rules(){
  return [
     ['money', 'validateMyBusiness', 'params' => ['targetAccount' => $this->account]];
  ]
}

# params array will be passed to our inline parameter as a second argument.