Yii2: how to use custom validation function for activeform?

Question

In my form\'s model, I have a custom validation function for a field defined in this way

class SignupForm extends Model
{
    public function rules()
    {
          


        

Answer 1

To make custom validations in yii 2 , you can write custom function in model and assign that function in rule. for eg. I have to apply password criteria in password field then I will write like this in model.

public function rules()
{
    return [
        ['new_password','passwordCriteria'],
    ];
}

public function passwordCriteria()
{
    if(!empty($this->new_password)){
        if(strlen($this->new_password)<8){
            $this->addError('new_password','Password must contains eight letters one digit and one character.');
        }
        else{
            if(!preg_match('/[0-9]/',$this->new_password)){
                $this->addError('new_password','Password must contain one digit.');
            }
            if(!preg_match('/[a-zA-Z]/', $this->new_password)){
                $this->addError('new_password','Password must contain one character.');
            }
        }
    }
}