GA4 Custom Dimensions

Hello, I don’t find any informations on how to set custom dimensions via zaraz.

I have setup an split testing on my website, managed in PHP, and I want to set a custom dimension to filter users in Google Analytics.

I’ve read the doc about additionnal fields (https://developers.cloudflare.com/zaraz/get-started/additional-fields/) but I dont understand how it works. What should I put in the field?

image

How can I set a dimension value from a value in PHP at user level ?

I want something like this :

gtag('set', 'user_properties', {
  app_landing_version: '<?= $app_landing_version ?>'
});
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