skip key and its value if key is empty in laravel

I am trying to skip key and it's value if empty.
Following example key f is empty and I want to remove that.

$array1 = array("a"=>1, "b"=>2, "c"=>3, "d"=>4, "e"=>5,"f"=>"","i"=>0);

Expected array in laravel

array
      'a' => int 1
      'b' => int 2
      'c' => int 3
      'd' => int 4
      'e' => int 5
      'i' => int 0

I have tried many way like taking if conditions, and array_filter but still not worked



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