Sounds to me likes he wants to do both. I assumed he could figure out that all he needs to do to go in the other direction is to replace euc-jp for utf8 and vice-versa.

$char_string = decode("utf8", $utf8_bytes);
$jp_bytes = encode("euc-jp", $char_string);
[download]

or

$jp_bytes = encode("euc-jp", decode("utf8", $utf8_bytes));
[download]

or

$jp_bytes = from_to($utf8_bytes, "utf8", "euc-jp");
[download]

or

$char_string = decode("utf8", $utf8_bytes);
binmode FH, ":encoding(euc-jp)";
print FH $char_string;
[download]