create unicode file in PHP, garbage in NLS languages

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PHP

Hi, I am using following code to receive data from a client PC. Then I am saving it in a text file. It is working for English. But, from server if I am sending NLS languages(Like Russians, or french), this files are showing garbage;

Working fine: English
Not working: Russian

$body = file_get_contents('php://input');
$today = date("dmY-Gis");
$name = $today . ".log";
//$FilePath = $HostFolder . "\\" . $name;
	
$f = fopen($name, "w+");
fwrite($f, utf8_encode($body));
fclose($f);

Can any one send me any clue?? Is it required to save open and create file in Unicode format?

Thanks