Set optional parameters of http_build_query #28
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If arg_separator is not set, the default value comes from arg_separator.output which is not always set to the value we need here, which is '&'. On Ubuntu the default is '&'. There is no need to adhere to any system defaults here because we know exactly in which context the URLs we build are used: for a backend request that is executed soon in the same PHP handler. The same parameters are used in the MapQuest provider.