My code:

ob_start();
if (!isset($_SESSION['userid'])) {
$cachetimeout=10;
eaccelerator_cache_page($_SERVER['PHP_SELF'].'?GET='.serialize($_GET), $cachetimeout);
} else {
$cachetimeout=-1;
}
$output = ob_get_contents());
ob_end_clean();

ob_start();
print $output;
ob_end_flush();

Output:
??????í
Help me!