The same warning / problem with admin treemenu descripted in
@see Ticket https://jira.ez.no/browse/EZP-22982

The current version of ezsys.php not working for our setup with nginx and php-fpm on fedora 21.
We get the warning descriped in EZP-22982

>>

With display_errors set to E_ALL and nginx, the content tree menu isn't shown in the backend (only the "Internal error" message).

Calling the requested url directly (/content/treemenu/2/.... reveals a JSON encoded PHP notice:

Warning: strpos(): Empty needle in /var/www/ezpublish/ezpublish_legacy/lib/ezutils/classes/ezsys.php line 1231"

I modified this line in the ezSys class locally, by not only comparing to /{$index}, but also to $index directly and it worked again.
>>>

no json output ist produced for content tree menu in the backend.
For us the first patch from Jérôme Vieilledent ist working
if ( $phpSelf === $index || $phpSelf === "/{$index}" )
@see https://github.com/ezsystems/ezpublish-legacy/commit/d75874b892a8fa2f79c14e581a7ab09b129ad65c