Description:
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parse_url fails to parse URLs with port 0 (like https://example.com:0/). While 0 is not a valid port, it is possible to send requests to it, and URLs with a zero port can be used for all kinds of purposes ( the URI itself is valid per https://tools.ietf.org/html/rfc3986#section-3.2.3 ). At a minimum, if this is an intentional constraint, it should be documented.

Test case: https://3v4l.org/36TqT
Affects all PHP versions starting with 5.3.6 (before it was parsed as expected).

See also #62159.

Test script:
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var_dump( parse_url('https://example.com:1/') );

var_dump( parse_url('https://example.com:0/') );