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  • A PHP backend will accept multiple entries with the key id[] and decode it as an array. The URLSearchParams API is a robust solution with proper percent-encoding. Commented Jul 15, 2019 at 15:50
  • @georgeawg Yes, but I suggested the JSON way because today every backend technology parses the JSON easily, so the front end would remain the same regardless of the backend tech we use. Commented Jul 15, 2019 at 15:54