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<?php parse_str("base_url=http://localhost:8000&selenium2[wd_host]=http://localhost:4444/wd/hub", $arr); print_r($arr);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [base_url] => http://localhost:8000 [selenium2] => Array ( [wd_host] => http://localhost:4444/wd/hub ) )