IRI::to_uri( string $string ): string

988    public function to_uri(string $string)989    {990        static $non_ascii;991        if (!$non_ascii) {992            $non_ascii = implode('', range("\x80", "\xFF"));993        }994 995        $position = 0;996        $strlen = strlen($string);997        while (($position += strcspn($string, $non_ascii, $position)) < $strlen) {998            $string = substr_replace($string, sprintf('%%%02X', ord($string[$position])), $position, 1);999            $position += 3;1000            $strlen += 2;1001        }1002 1003        return $string;1004    }