Use php namespace inside function

From Scoping rules for importing

The use keyword must be declared in the outermost scope of a file (the
global scope) or inside namespace declarations. This is because the
importing is done at compile time and not runtime, so it cannot be
block scoped

So you should put like this, use should specified at the global level

use test\Class;

function go(){
    $go = 'ok';
    return $go;
echo go();

Check the example 5 in the below manual
Please refer to its manual at

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