Memory.

I've asked these questions a number of other places. It seems no-one really knows. So, even if this might not be the right list for these questions, I hope someone can bare with me and help answer a few questions, or direct me to someone or some doc that can. Questions: 1) Since there are no functions to tell the memory usage of variables and objects, is there a way to calculate memory usage of variables and objects? 2) When a script loads different files as includes, does it take from the memory_limit pool of memory? 3) When leaving a function, are variables in the function's scope freed? I.e. is the memory used by a function completely freed for the rest of the script to reuse? 4) Is there any way to free memory used within a script? Does for instance $var = ""; free the memory previously used by $var? 5) Is it not aa good idea to use objects if you plan to collect thousends of them in PHP? Do they for some reason take up substantially more memory than other variables? Thank you for any answers, or help in finding the right people to ask. -- Vego