tify(string|integer  <span class="argument">$user_id</span>, [optional] string|integer <span class="argument">$anon_id</span>) </pre>
                <p><em>Identify the user you want to associate to tracked events. The $anon_id must be UUID v4 format and not already merged to an $identified_id. All identify calls with a new and valid $anon_id will trigger a track $identify event, and merge to the $identified_id.</em></p>
                

                                    <h4>Parameters</h4>
            