Memory.

My questions concern memory usage, and I've seen similar questions posted here before without anyone beeing capable of answering them. My first question is therefore: Does anyone know where I could ask questions about internal PHP memory usage? The internal list? Questions: 1) Since there are no functions to tell the 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 free()'d? I.e. is the memory used by a function completely freed for the rest of the script? 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