skip key and its value if key is empty in laravel

i am trying to skip key and its value if empty .
following example "f" is key and value is empty then i want to skip that.

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

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

i tried many way like taking if conditions array_filter but still not worked

via Chebli Mohamed