I can confirm this behavior[1], but like the documentation[2]
states:

| Partial URLs are also accepted, parse_url() tries its best to
| parse them correctly.

So, in my opinion, this is not a bug (and might be duplicate
anyway).

[1] <https://3v4l.org/h4EMu>
[2] <https://www.php.net/parse_url>

The url must be formatted correctly for parse_url to work because it relies on the / symbol as a term separator.

$url = 'http://username:password@hostname:9090/path?arg=value#anchor';
$data=parse_url($url);
Print_r($data);
would return:
Array ( [scheme] => http [host] => hostname [port] => 9090 [user] => username [pass] => password [path] => /path [query] => arg=value [fragment] => anchor ) 

$url = 'http://username:password@hostname:9090/path?arg=value#anchor';
var_dump(parse_url($url));

will output the string.length.count with the array:

array(8) { ["scheme"]=> string(4) "http" ["host"]=> string(8) "hostname" ["port"]=> int(9090) ["user"]=> string(8) "username" ["pass"]=> string(8) "password" ["path"]=> string(5) "/path" ["query"]=> string(9) "arg=value" ["fragment"]=> string(6) "anchor" }  

The "host" tag returns a FQDN only, local alias such as localhost will be listed in "scheme"

Hi folk, i did the same test with FQDN and...

Test script:
---------------

<?php

var_dump(parse_url('http://localhost:80?a=1'));

?>


Result:
----------------

array(4) {
  ["scheme"]=>
  string(4) "http"
  ["host"]=>
  string(9) "localhost"
  ["port"]=>
  int(80)
  ["query"]=>
  string(3) "a=1"
}

This result is expected .

Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

Thank you for taking the time to write to us, but this is not
a bug. Please double-check the documentation available at
http://www.php.net/manual/ and the instructions on how to report
a bug at http://bugs.php.net/how-to-report.php

This is not a bug according to the manual.

"This function is not meant to validate the given URL, it only breaks it up into the above listed parts. Partial URLs are also accepted, parse_url() tries its best to parse them correctly."