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Retrieve the user information component of the URI.
If no user information is present, this method MUST return an empty string. If a user is present in the URI, this will return that value; additionally, if the password is also present, it will be appended to the user value, with a colon (":") separating the values. The trailing "@" character is not part of the user information and MUST NOT be added.
$string = getUserInfo();
string The URI user information, in "username[:password]" format.
File name: wordpress-seo/vendor_prefixed/psr/http-message/src/UriInterface.php
public function getUserInfo();