Use GET parameters to query for array of entry IDs
I found a response for Craft 2 that looks like it's similar to what I want: (Passing multiple parameters to the Element API) which uses the getQuery() or getRequiredQuery() functions, but I'm not sure those still exist in Craft 3?


In Craft 3, you'd use:

Craft::$app-&gt;getRequest()-&gt;getRequiredQueryParam('myArr')


https://docs.craftcms.com/api/v3/craft-web-request.html#method-getrequiredqueryparam