YII2.0使用PDO连接Oracle库查询结果中文显示乱码问题[2.0]

在网上搜到很多关于PDO连接Oracle的示例，但是实际使用中还是乱码了。数据库oracle的编码是utf8的，显示到页面却是gbk编码。
貌似连接串里的charset=utf-8未生效。
需要改YII2.0的代码：\vendor\yiisoft\yii2\db\Connection.php，在in_array里面加上oci

/**
     * Initializes the DB connection.
     * This method is invoked right after the DB connection is established.
     * The default implementation turns on `PDO::ATTR_EMULATE_PREPARES`
     * if [[emulatePrepare]] is true, and sets the database [[charset]] if it is not empty.
     * It then triggers an [[EVENT_AFTER_OPEN]] event.
     */
    protected function initConnection()
    {
        $this->pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        if ($this->emulatePrepare !== null && constant('PDO::ATTR_EMULATE_PREPARES')) {
            $this->pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, $this->emulatePrepare);
        }
        if ($this->charset !== null && in_array($this->getDriverName(), ['pgsql', 'mysql', 'mysqli', 'cubrid', 'oci'])) {
            $this->pdo->exec('SET NAMES ' . $this->pdo->quote($this->charset));
        }
        $this->trigger(self::EVENT_AFTER_OPEN);
    }


在配置数据库的地方做如下配置：

return [
    'class' => 'yii\db\Connection',
    'dsn' => 'oci:dbname=//db.cms.china.com:7137/deptdb;charset=utf8',
    'username' => 'editor',
    'password' => 'editor123',
];

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好棒，顶一个，大美女写的啊