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<?php var_dump( mb_convert_encoding( $bin = hex2bin("82ad9951"), "UTF-8", "SJIS-2004" ), mb_check_encoding($bin, "SJIS-2004") );
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(6) "く儔" bool(true)
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30
string(6) "く儔" bool(false)
preferences:
121.94 ms | 402 KiB | 121 Q