通过检查当前密码和输入的密码来修改yii2密码

我试图在yii2高级应用程序中更改密码，但总是失败

我有一个模型，它找到输入的密码，并检查它与存储的密码，如果它是真，它返回真，但如果它是假，它应该失败。

这是模型部分

设置用户密码

public function setPassword($password)
{
    $this->password = Yii::$app->security->generatePasswordHash($password);
}

这是用来比较两个密码

    public function findPasswords($attribute, $params){
        $user = UserIdentity::find()->where([
            'username'=>Yii::$app->user->identity->username
        ])->one();

         $password = $user->password_hash;  //returns current password as stored in the dbase
       $hash2 = Yii::$app->security->generatePasswordHash($this->oldpass); //generates an encrypted password
           if($password!= $hash2)
           {
                    $this->addError($attribute, 'Old password is incorrect');
           }
    }

这总是返回旧密码不正确。我也试过

var_dump(Yii::$app->security->generatePasswordHash(5378));
var_dump(Yii::$app->security->generatePasswordHash(5378));

上面的两个返回两个不同的值，为什么呢?

怎么了??

这是更新后的完整用户模型我现在得到一个获取未知属性的错误:app'models'UserPass::password_hash

class UserPass extends Model{
    public $oldpass;
    public $newpass;
    public $repeatnewpass;
    public function rules(){
        return [
            [['oldpass','newpass','repeatnewpass'],'required'],
            ['oldpass','findPasswords'],
            ['repeatnewpass','compare','compareAttribute'=>'newpass'],
        ];
    }

    public function findPasswords($attribute, $params){
        $user = UserIdentity::find()->where([
            'username'=>Yii::$app->user->identity->username
        ])->one();

        $valid = $this->validatePassword("53785378");
        var_dump(validatePassword("53785378"));
        die();
         $password = $user->password_hash;  //returns current password as stored in the dbase
       $hash2 = Yii::$app->security->generatePasswordHash($this->oldpass); //generates an encrypted password
           if($password!= $hash2)
           {
                    $this->addError($attribute, 'Old password is incorrect');
           }
    }
    public function attributeLabels(){
        return [
            'oldpass'=>'Old Password',
            'newpass'=>'New Password',
            'repeatnewpass'=>'Confirm Password',
        ];
    }
   public function validatePassword($password) {
        return Yii::$app->security->validatePassword($password, $this->password_hash);
    }

}

/**
 * Validates password
 *
 * @param string $password password to validate
 * @return boolean if password provided is valid for current user
 */
public function validatePassword($password) {
    return Yii::$app->security->validatePassword($password, $this->password_hash);
}

Yii::$app->security->generatePasswordHash(5738);

$hash2 = Yii::$app->security->generatePasswordHash($this->oldpass);
if($password!= $hash2)
{
    $this->addError($attribute, 'Old password is incorrect');
}

$validateOldPass = Yii::$app->security->validatePassword($this->oldpass,$password);
if(!$validateOldPass)
{
    $this->addError($attribute, 'Old password is incorrect');
}