Comment by abrookewood

I love the pipe operator - one of the things I dig about Elixir though many languages have it. It's so much easier to reason about:

  $result = $arr
    |> fn($x) => array_column($x, 'tags')
    |> fn($x) => array_merge(...$x)
    |> array_unique(...)
    |> array_values(...)

VS array_values(array_unique(array_merge(...array_column($arr, 'tags'))));