models/AccountLoginForm.php
public function login()
	{
		return $this->validate() ? Yii::$app->user->login($this->getUser(), $this->rememberMe ? UserModule::$rememberMeDuration : 0) : FALSE;
	}
public function login()
	{
		return $this->validate() ? Yii::$app->user->login($this->getUser(), $this->rememberMe ? UserModule::$rememberMeDuration : 0) : FALSE;
	}
Logs in a user using the provided username and password.

@return boolean whether the user is logged in successfully