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<?php $address = 'scheme://[aa:dd::]:123'; var_dump(parse_url($address));
Output for 4.3.7 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(3) { ["scheme"]=> string(6) "scheme" ["host"]=> string(9) "[aa:dd::]" ["port"]=> int(123) }
Output for 4.3.2 - 4.3.6
Warning: parse_url(scheme://[aa:dd::]:123): Unable to parse url in /in/1B6NO on line 4 bool(false)
Output for 4.3.0 - 4.3.1
Warning: parse_url(scheme://[aa:dd::]:123) [http://www.php.net/function.parse-url]: Unable to parse url in /in/1B6NO on line 4 bool(false)

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