Thank you for your contribution. You may look at the http_build_query which helps to build the query string, because some characters need to be urlencode (and htmlspecialchars may not help).
Also, try not to use global variable such as roundRobin as it makes your function tightly coupled and not easy to unit-tested. The pgreped in pidKill should be tested for validity e.g. if it is "" or None, your script may break.

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