finding systems free memory using php program

Finding free memory

[suganyaraju]

Hi
i need to know the free memory of a system for running some programs.
can u plz tell me how to find free memory by php program

[penders]

I think a certain amount of memory is allocated to PHP processes, so this may not be the same as the amount of free memory on the system?

PHP manual: memory_get_usage() [uk.php.net]