PHP has parse_url() but no build_url()

[jclaveau]

This discussion in stackoverflow explicits the problem in detail.

https://stackoverflow.com/questions/4354904/php-parse-url-reverse-parsed-url

The best solution seems, to me, to be https://stackoverflow.com/a/31691249/2714285 as it provides tests:

function unparse_url(array $parsed): string {
    $pass      = $parsed['pass'] ?? null;
    $user      = $parsed['user'] ?? null;
    $userinfo  = $pass !== null ? "$user:$pass" : $user;
    $port      = $parsed['port'] ?? 0;
    $scheme    = $parsed['scheme'] ?? "";
    $query     = $parsed['query'] ?? "";
    $fragment  = $parsed['fragment'] ?? "";
    $authority = (
        ($userinfo !== null ? "$userinfo@" : "") .
        ($parsed['host'] ?? "") .
        ($port ? ":$port" : "")
    );
    return (
        (\strlen($scheme) > 0 ? "$scheme:" : "") .
        (\strlen($authority) > 0 ? "//$authority" : "") .
        ($parsed['path'] ?? "") .
        (\strlen($query) > 0 ? "?$query" : "") .
        (\strlen($fragment) > 0 ? "#$fragment" : "")
    );
}

function unparse_url_test() {
    foreach ([
        '',
        'foo',
        'http://www.google.com/',
        'http://u:p@foo:1/path/path?q#frag',
        'http://u:p@foo:1/path/path?#',
        'ssh://root@host',
        '://:@:1/?#',
        'http://:@foo:1/path/path?#',
        'http://@foo:1/path/path?#',
    ] as $url) {
        $parsed1 = parse_url($url);
        $parsed2 = parse_url(unparse_url($parsed1));

        if ($parsed1 !== $parsed2) {
            print var_export($parsed1, true) . "\n!==\n" . var_export($parsed2, true) . "\n\n";
        }
    }
}

unparse_url_test();