php - Yii2 login. Yii::$app->user->login($user, 0) doesnt save -
 I am trying to apply the login to my site. But  Yii :: $ app- & gt; User- & gt; Login ($ user, 0)  does not save the identity. 
When I log in now it works fine:
  if (Yii :: $ app-> user- & gt; login ($ user, 0 )) {Var_dump (Yii :: $ app-> User-> Identity); } Else {echo 'did not login'; }     show var_dump ()  identity 
 but when I show another controller  var_dump ()  < Code> NULL : 
  // Another controller trying to get recognition in var_dump (Yii: $ app-> User-> Identity);   Does anybody know about this problem?
OK. The Russian yii Forum answered in the boy. ()
  Namespace ap model; Use Yii \ db \ ActiveRecord; Use Yii \ web \ IdentityInterface; Class User ActiveRecord implies the IdentityInterface {}    I should implement the  IdentityInterface  and I forgot it now works well! 
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