웹상에 gzip 처리하기

<?
function checkCanGzip() {

     global $HTTP_ACCEPT_ENCODING;
    
     if (headers_sent()) return 0;
     if (strpos($HTTP_ACCEPT_ENCODING, 'x-gzip') !== false) return "x-gzip";
     if (strpos($HTTP_ACCEPT_ENCODING,'gzip') !== false) return "gzip";
     return 0;

}

function gzDocOut() {

     if ($encoding = checkCanGzip()) {
     $contents = ob_get_contents();
     ob_end_clean();
     header("Content-Encoding: ".$encoding);
     print("\x1f\x8b\x08\x00\x00\x00\x00\x00");
     $size = strlen($contents);
     $contents = gzcompress($contents, 9);
     $contents = substr($contents, 0, $size);
     print($contents);
//        print(pack('V', crc32($contents)));
//        print(pack('V', $size));
     exit();
     }
     else {
     ob_end_flush();
     exit();
     }
    
}

ob_start();
ob_implicit_flush(0);

print("your stuff...");

gzDocOut();

?>