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function binary_dump($in)
{
	$bindata	= unpack("C*", $in );
	$ret		= "";
	foreach($bindata as $v){
		$ret	.= sprintf("%02x ",$v);
	}
	return $ret;
}

$sjis	= "バイナリダンプ";
$utf8	= mb_convert_encoding($sjis,"UTF-8","SJIS");
echo "SJIS:".binary_dump($sjis)."\r\n";
echo "UTF8:".binary_dump($utf8)."\r\n";

$ php dump.php
SJIS:83 6f 83 43 83 69 83 8a 83 5f 83 93 83 76
UTF8:e3 83 90 e3 82 a4 e3 83 8a e3 83 aa e3 83 80 e3 83 b3 e3 83 97