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run code in 150+ php & hhvm versions
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<?php mb_substitute_character(0xfffd); var_dump(bin2hex(mb_convert_encoding("\x61\xF1\x80\x80\xE1\x80\xC2\x62",'UTF-16','UTF-8')));
Output for 5.4.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(20) "0061fffdfffdfffd0062"
Output for 4.3.0 - 5.3.29
string(8) "00610062"