<?
/**
* Initialise GZIP
*/

function initGzip_quik() {
global $mosConfig_gzip, $do_gzip_compress;

$do_gzip_compress = FALSE;
$phpver = phpversion();
$useragent = $_SERVER['HTTP_USER_AGENT'];
$canZip = $_SERVER['HTTP_ACCEPT_ENCODING'];

$gzip_check = 0;
$zlib_check = 0;
$gz_check = 0;
$zlibO_check = 0;
$sid_check = 0;
if ( strpos( $canZip, 'gzip' ) !== false) {
$gzip_check = 1;
}
if ( extension_loaded( 'zlib' ) ) {
$zlib_check = 1;
}
if ( function_exists('ob_gzhandler') ) {
$gz_check = 1;
}
if ( ini_get('zlib.output_compression') ) {
$zlibO_check = 1;
}
if ( ini_get('session.use_trans_sid') ) {
$sid_check = 1;
}

if ( $phpver >= '4.0.4pl1' && ( strpos($useragent,'compatible') !== false || strpos($useragent,'Gecko') !== false ) ) {
// Check for gzip header or northon internet securities or session.use_trans_sid
if ( ( $gzip_check || isset( $_SERVER['---------------']) ) && $zlib_check && $gz_check && !$zlibO_check && !$sid_check ) {
// You cannot specify additional output handlers if
// zlib.output_compression is activated here
ob_start( 'ob_gzhandler' );
return;
}
} else if ( $phpver > '4.0' ) {
if ( $gzip_check ) {
if ( $zlib_check ) {
$do_gzip_compress = TRUE;
ob_start();
ob_implicit_flush(0);

header( 'Content-Encoding: gzip' );
return;
}
}
}
ob_start();
}

/**
* Perform GZIP
*/
function doGzip_quik() {
global $do_gzip_compress;
if ( $do_gzip_compress ) {
/**
*Borrowed from php.net!
*/
$gzip_contents = ob_get_contents();
ob_end_clean();

$gzip_size = strlen($gzip_contents);
$gzip_crc = crc32($gzip_contents);

$gzip_contents = gzcompress($gzip_contents, 9);
$gzip_contents = substr($gzip_contents, 0, strlen($gzip_contents) - 4);

echo "\x1f\x8b\x08\x00\x00\x00\x00\x00";
echo $gzip_contents;
echo pack('V', $gzip_crc);
echo pack('V', $gzip_size);
} else {
ob_end_flush();
}

}
?>

in source:
...
initGzip_quik()
print $content_just_any_var
doGzip_quik()


it's work in all browsers