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run code in 300+ PHP versions simultaneously
<?php print_r(parse_url('http://[:::127.0.0.1]:123/hello'));
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 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Array ( [scheme] => http [host] => [:::127.0.0.1] [port] => 123 [path] => /hello )
Output for 4.3.2 - 4.3.6
Warning: parse_url(http://[:::127.0.0.1]:123/hello): Unable to parse url in /in/mZ8A8 on line 3
Output for 4.3.0 - 4.3.1
Warning: parse_url(http://[:::127.0.0.1]:123/hello) [http://www.php.net/function.parse-url]: Unable to parse url in /in/mZ8A8 on line 3

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