What product are you using? I'm pretty sure we have removed all of the references to split() in the latest version of all of our extensions, so I'd like to know what page or extension you are using that has this issue still, or at least confirm it is an older version.
The solution is to either upgrade, to manually go through the code and change the split() to explode(), or to turn off warnings because it will actually still work and the warning could simply be ignored for now.
Did this help? Tips are appreciated...
