Cyrillic in utf-8 Yandex direct?

Question

PHP

https://site.ru/?utm_source=yandex&utm_medium=cpc&...
I made utm tags (above example)
what is in brackets (above) {} Yandex should substitute ad numbers automatically from Yandex direct, but Yandex says they say:
In ads with templates, cyrillic characters from the URL are automatically encoded in utf-8. It is important that your site correctly accept requests in this encoding.
If the URL exceeds 4096 bytes, parameter values ​​will only be passed for the yclid and openstat tags.
How to fix it so that Yandex substitutes all the same numbers automatically?

Answer 1

Read here - https://ru.wikipedia.org/wiki/URL