`zend_enum_new()` is not intended to be used “at runtime”, since it will create
a new object, breaking the singleton property. Instead
`zend_enum_get_case_cstr()` must be used.
Relates to #14461 and https://wiki.php.net/rfc/url_parsing_api
Co-authored-by: Niels Dossche <7771979+nielsdos@users.noreply.github.com>
Co-authored-by: Tim Düsterhus <tim@tideways-gmbh.com>