[phpesp-general] Error when I try to test survey

[<me...@sh...>]

Hi
I get the following error when I try to test a completed survey
Fatal error: Call to undefined function: array_insersect() in
/home/**/****/***/***/include/where/status.inc on line 34
The survey was created by a member of the design group and I am a superuser
(with full privileges I assume) trying to test the survey.
Any help would, as usual, be very much appreciated