PHP remove empty tring from array

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I'm trying to remove all empty strings "" from the kat-array. I tried to do it by using array_filter function like this:

$array = array_filter($array, "strlen");

The problem is that kat[4] is now an object instead of an array.

Any idea how I can remove empty stings from an array without transforming them into an object?

Before

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After

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