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<?php var_dump(filter_var("http://@127.0.0.1/", FILTER_VALIDATE_URL)); var_dump(filter_var("http://user:@127.0.0.1/", FILTER_VALIDATE_URL)); var_dump(parse_url("http://@127.0.0.1/"));
Output for 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
string(18) "http://@127.0.0.1/" string(23) "http://user:@127.0.0.1/" array(4) { ["scheme"]=> string(4) "http" ["host"]=> string(9) "127.0.0.1" ["user"]=> string(0) "" ["path"]=> string(1) "/" }

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30.77 ms | 1156 KiB | 7 Q