title: Yii2 WHERE IN query
body: <p>The following active record WHERE IN query does not work. According to the docs this should work:</p>
  
  <pre><code>$data = $dropDownData-&gt;find()
                      -&gt;select('country, country_text')
                      -&gt;distinct()
                      -&gt;WHERE(['in', 'server', $servers]);
  
  $listData = ArrayHelper::map($data,'country', 'country_text');
  </code></pre>
  
  <p>The sql equivalent is :</p>
  
  <pre><code>$query = "SELECT DISTINCT country, country_text 
            FROM `dropDownData` 
            WHERE server IN ({$servers})";
  </code></pre>
  
  <p>$servers just contains a string 1,2,4</p>
  
  <p>What am I doing wrong here?</p>