$string = 'Kompress aku...';
$fh = fopen('file.gz', 'w');
stream_filter_append($fh, 'zlib.deflate', STREAM_FILTER_WRITE, 9);
fwrite($fh, $string);
fclose($fh);

$fh = fopen('file.gz', 'r');
stream_filter_append($fh, 'zlib.inflate', STREAM_FILTER_READ);
fpassthru($fh); // Kompress aku...
fclose($fh);
