title: Query efficiency
body: <pre><code>$_query = 'UPDATE ' . TABLE_A1 . ' SET active=0 WHERE user_id IN ( ';
                  foreach ($newUsers as $newUser) {
                      $_query.=$newUser. ' ,';
                  }
                  $_query = rtrim($_query, ',');
                  $_query .=')';
  </code></pre>
  
  <p>Is this a performant way of editing multiple table entries at once? Are there faster ways?</p>
  
  <p>thanks</p>