为什么我无法在Mixpanel中创建别名？

Question

In Mixpanel I have an user who have the automatic distinct_id 145dsfds-sdfsdf (example). I want to create an alias for that user to 1234

My PHP code:

require ('mixpanel/mixpanel.php');
$original_id = '145dsfds-sdfsdf'; // Example original
$uid = 1234;
$token = '2j34j3j4j3j'; // Token of my project on Mixpanel

$_mp = new Mixpanel($token);
$_mp->createAlias($original_id,  $uid);
$_mp->people->set($uid, array(
    'uid'   => $uid
));

After run, I go into Mixpanel and filter people with id 1234 and retrieve no result. But if we visualize the details of user 145dsfds-sdfsdf, the property uid have value 1234.

I don't understand what's happening.

Answer 1

The root of the issue here is that Mixpanel's alias function is designed to remap the uid to the original_id but not the reverse.

Essentially, if an alias is successfully made, the distinct_id you see in live-view will be a original_id, not the uid.

The alias function allows you to tie pre-authentication events to post-authentication events without needing to edit the events already stored in Mixpanel (events are immutable once they are in a project).