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<?php mb_internal_encoding('ISO-2022-JP'); var_dump( mb_decode_mimeheader( mb_encode_mimeheader( mb_convert_encoding( "あいうえおかきくけこさしすせそたちつてとなにぬねのはひふへほまみむめもやいゆえよらりるれろわゐうゑをん", "ISO-2022-JP", "UTF-8" ), "ISO-2022-JP" ) ) );
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.6
string(108) "$B$"$$$&$($*$+$-$/$1$3$5$7$9$;$=$?$A$D$F$H$J$K$L$M$N$O$R$U$X$[$^$_$`$a$b$d$$$f$($h$i$j$k$l$m$o$p$&$q$r$s(B"
preferences:
76.83 ms | 1125 KiB | 4 Q