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run code in 150+ php & hhvm versions
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<?php var_dump(parse_url('//asb'));
Output for 5.4.7 - 5.6.22, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { ["host"]=> string(3) "asb" }
Output for 4.3.0 - 5.4.6
array(1) { ["path"]=> string(5) "//asb" }