3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump( mb_convert_encoding( $bin = hex2bin("9dc8f1d78bc795afe3e0f844e0c0eef08d4df349"), "UTF-8", "SJIS-Mobile#DOCOMO" ), mb_check_encoding($bin, "SJIS-Mobile#DOCOMO") );

preferences:
30.78 ms | 407 KiB | 5 Q