- %1$s is private and should not be used in themes or plugins directly.
_wp_sanitize_utf8_in_redirect ( $matches )
- (array) $matches RegEx matches against the redirect location.
- (string) URL-encoded version of the first RegEx match.
- Introduced in WordPress: 4.2.0
- Deprecated in WordPress: —
URL encode UTF-8 characters in a URL.