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<?php var_dump(parse_url("http://[::1]"));
Output for 4.3.7 - 7.2.0
array(2) { ["scheme"]=> string(4) "http" ["host"]=> string(5) "[::1]" }
Output for 4.3.0 - 4.3.6
array(2) { ["scheme"]=> string(4) "http" ["host"]=> string(1) "[" }