title: Case sensitive query in yii2
body: <p>To find record in yii2 I use following code:</p>
  
  <pre><code>$response = Response::findOne(['unique_url' =&gt; $unique_url]);
  </code></pre>
  
  <p>But it return record regardless <code>$unique_url</code> case.
  How to do it case sensitive?</p>