yii2中文亂碼

<?php return [     &#39;class&#39; =>?'YIIdbConnection', ????'dsn'?=&gt;?'mysql:host=127.0.0.1;?dbname=ohmycto;?charset=utf8', ????'username'?=&gt;?'website', ????'password'?=&gt;?'mengde1B', ];