Description:
------------
When using php in fastcgi mode, it does not detect any user abort. connection_status() always return 0, even after user aborts connection.

Reproduce code:
---------------
<?
ignore_user_abort(true);

echo "hello";
flush();
sleep(10);
echo "bye"

$fp=fopen('/tmp/conection_log.txt','a');
fputs($fp,'Connection status is: '.connection_status()."\n");
fclose($fp);
?>

Expected result:
----------------
Return 0

Actual result:
--------------
Not return 0.