I searched a lot, checked many times the neccesary steps, but it still don\'t work.
My environment is :
Latest eclipse for PHP developer package
There seem to still be a lot of bugs related to auto-completion for the PHP Development Tools Project (PDT) (See Open Bugs).
One has been entered two days ago: bug 286733 "When using sub namespace completion does not work."
But this is hardly the only one:
[php 5.3] Code assist doesn't provide method completion" (bug 286068)They are all related to the namespace of the PHP code. Could you check if you reproduce the error in a global namespace?