Some equivalent like autoload/Just-In-Time for non-OOP function libraries in php?

[Slay33]

I'm working on a codebase with a lot of non-OO function libraries, and personally, I don't love php's java-inspired OO model.Unfortunately, I'm trying to solve the problem of the overhead that you get with a lot of included libraries, and see a lot of recommendation for autoloading. Which only works with classes.Is there any way to reduce the overhead of included libraries of functions in a manner like autoload? By making use of php 5.3 namespaces, say?I certainly don't want to move all of these (often diverse) libraries of functions to classes to get performance gain (the bugs wouldn't make it worth it), so is there a simpler way to optimize function library includes in simple ways?Is inclusion of function libraries in php just fast enough that I shouldn't worry about it?