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<?php $utf8='η.∊'; var_dump($utf8, mb_convert_encoding($utf8,'CP1252','UTF-8'), mb_convert_encoding(mb_convert_encoding($utf8,'CP1252','UTF-8'),'UTF-8','CP1252') );
Output for 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.26, 8.0.0 - 8.0.13, 8.1rc1 - rc3
string(6) "η.∊" string(3) "?.?" string(3) "?.?"

preferences:
30.54 ms | 460 KiB | 5 Q