Description:
------------
HTTP spec describes Accept-Encoding as a list with "quality values", i.e. it can be something like:

Accept-Encoding: gzip;q=1.0, deflate;q=0.7

There is a special case when q equals zero which means the client does NOT accept that particular value

Because the ob_gzhandler() is implemented with a strstr(Z_STRVAL_P(enc), "gzip"), the check fails to exclude "gzip;q=0"


Test script:
---------------
<?php
ob_start("ob_gzhandler");
echo "Hello";