Description:
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The int $http_response_code for later calls to header() don't update any earlier codes set with header('Status: ???'). The Documentation claims that it "Forces the HTTP response code to the specified value". If header('Status: ...') has not been used beforehand, setting http_response_code works as expected.

Test script:
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<?php
header('Status: 500 Internat Server Error', true, 500);
header('Status: 200 OK', true, 200);
header('WWW-Authenticate: Basic realm="Access"', true, 401);
/* this would work: header('Status: 401 OK', true, 401); */