title: insert multiple row to db in same time with multi_query
body: <p>I have to insert 2 queries and I want run them with multi_queries. In every run of the file there should be 2 row added to the table but my problem is that they don't get inserted. My connection to the db is ok and I tested the queries with that</p>
  
  <pre><code>    $q1 ="INSERT INTO auto_charge(phone,charged_at,created_at,updated_at) VALUES ('123456789','2018-01-24 12:37:07','2018-01-27 09:19:42','2018-01-27 09:19:42')";
      $q1 .="INSERT INTO auto_charge(phone,charged_at,created_at,updated_at) VALUES ('987654321','2018-01-24 12:37:07','2018-01-27 09:19:42','2018-01-27 09:19:42')";
      $result = $conn-&gt;multi_query( $q1 );
  </code></pre>