limit for mmaping for readfile (Bug #19749)

http://bugs.php.net/bug.php?id=19749 It's been playing on my mind recently that this bug hasn't been addressed; the problem was how to guess precisely what limit to set for mmaping when doing something like readfile(). [note that some comments are missing from the bugdb for that bug] Well, we can solve the problem by allowing the sysadmin to decide, as you can see in my patch against PHP 5: http://www.php.net/~wez/mmap-limit.diff The default limit is 8MB. If the limit is set to 0, no limit is applied. This is separate from memory_limit, so PHP could potentially use double the default memory amount for a short period of time. This is still better than allowing it to eat all the RAM when someone decides to readfile() large media files for example. --Wez.