1. Whether password contains the username
2. Whether password contains an email string
3. Minimum number of characters
4. Maximum number of characters
5. Minimum number of lower space characters
6. Minimum number of upper space characters
7. Minimum number of numeric / digit characters
8. Minimum number of special characters

Other features:

1. Includes 5 presets (simple, normal, fair, medium, and strong). Instead of setting each parameter above, you can call a preset which will auto-set each of the parameters above.
2. It includes both server and client validation.
3. This can work with the PasswordInput widget (described next) as per your needs. The strength validation routines for both are a bit different. The PasswordInput widget focuses on displaying the strength only, and does not restrict the user input in any way.

// add this in your model
use kartik\password\StrengthValidator;

// use the validator in your model rules
public function rules() {
    return [
        [['username', 'password'], 'required'],
        [['password'], StrengthValidator::className(), 'preset'=>'normal', 'userAttribute'=>'username']
    ];
}

1. Allows you to show/ hide the password text (using bootstrap styled input addons). You can configure this option to be shown or not.
2. Allows you to display an advanced password strength meter to calculate and show your password strength as you type.
3. Allows you to control and position/style your meter based on templates.
4. A password strength meter consists of the meter bar, the score, and the verdict.
5. Uses Bootstrap library styling wherever possible with inbuilt Yii 2.0 ActiveField functionality.
6. Works independent and complements the StrengthValidator.

The important options to pass to this widget are:

• bsVersion: string | int, the bootstrap library version to be used for the extension. Refer the Bootstrap Info section for details and pre-requisites on setting this property.

  • To use with Bootstrap library - you can set this to any string starting with 3 (e.g. 3 or 3.3.7 or 4.x / 3.x)

  • To use with bootstrap 4 - you can set this to any string starting with 4 (e.g. 4 or 4.6.0 or 4.x)

  • To use with bootstrap 5 - you can set this to any string starting with 4 (e.g. 5 or 5.1.0 or 5.x)

• bsColCssPrefixes: array, the bootstrap grid column css prefixes mapping, the key is the bootstrap versions, and the value is an array containing the sizes and their corresponding grid column css prefixes. The class using this trait, must implement kartik\base\BootstrapInterface. If not set will default to:.

  [
     3 => [
        self::SIZE_X_SMALL => 'col-xs-',
        self::SIZE_SMALL => 'col-sm-',
        self::SIZE_MEDIUM => 'col-md-',
        self::SIZE_LARGE => 'col-lg-',
        self::SIZE_X_LARGE => 'col-lg-',
        self::SIZE_XX_LARGE => 'col-lg-',
     ],
     4 => [
        self::SIZE_X_SMALL => 'col-',
        self::SIZE_SMALL => 'col-sm-',
        self::SIZE_MEDIUM => 'col-md-',
        self::SIZE_LARGE => 'col-lg-',
        self::SIZE_X_LARGE => 'col-xl-',
        self::SIZE_XX_LARGE => 'col-xl-',
     ],
     5 => [
        self::SIZE_X_SMALL => 'col-',
        self::SIZE_SMALL => 'col-sm-',
        self::SIZE_MEDIUM => 'col-md-',
        self::SIZE_LARGE => 'col-lg-',
        self::SIZE_X_LARGE => 'col-xl-',
        self::SIZE_XX_LARGE => 'col-xxl-',
     ],
  ];
  

• model Model the model object to be passed

• attribute string the model attribute to be validated (e.g. password)

// add this in your view
use kartik\password\PasswordInput;

// Usage with ActiveForm
echo $form->field($model, 'password')->widget(
    PasswordInput::classname()
);

// Usage with model and without ActiveForm 
echo PasswordInput::widget([
    'model' => $model, 
    'attribute' => 'password_1'
]);

// Usage without a model or ActiveForm
echo PasswordInput::widget([
    'name' => 'password_2'
]);

The yii2-password extension can be installed automatically or manually using one of these options:

$ php composer.phar require kartik-v/yii2-password "dev-master"

"kartik-v/yii2-password": "dev-master"