hello. i want to use gzip for my web. so i am start to searching google. then 2 code.

1 > what must i do with this code?where i must put it???
ob_start ("ob_gzhandler");
header("Content-type: text/css; charset: UTF-8");
header("Cache-Control: must-revalidate");
$offset = 60 * 60 ;
$ExpStr = "Expires: " .
gmdate("D, d M Y H:i:s",
time() + $offset) . " GMT";

then htaccess addons

HTACCESS ADDON <<< where must i put??

AddHandler application/x-httpd-php .css
php_value auto_prepend_file gzip-css.php
php_flag zlib.output_compression On

any one can helping me out from my problem??