Re: [PHP-DEV] *crash* on try to find out how many nesting levelsare allowed From: Zeev Suraski (zeev <email protected>)
Date: 07/09/00

On Sun, 9 Jul 2000, Shane Caraveo wrote:

>
>
> Stanislav Malyshev wrote:
> >
> > w>> I wanted to find out how many nesting levels are allowed, but after
> > w>> class "a" gets instanciated from inside of "b", PHP crashes, that should
> > w>> not be.
> >
> > And what did you expect? You tried to crash it, you succeeded. Infinite
> > recursion leads to crash. Try it in C, you get the same.
>
> That's an entirely lame attitude. The goal here should be a stable php,
> irregardless of the quality of code php is running. In the case of
> infinite loops, recursions, etc., php can either throw an error if it is
> somehow recognizable, or it can simply timeout. Allowing it to crash
> because 'infinite recursion leads to crash' is pathetic. If it crashes,
> it can be fixed.

As a matter of fact, it can't be. There's no way to recover from stack
overflows in UNIX, you can't really tell for sure (in a reasonable,
portable way) how much stack space you have left, and even if you could
tell, it would be way too slow and clumsy to protect against it.

Zeev 

-- 
Zeev Suraski <zeev <email protected>>
http://www.zend.com/

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