> I am trying to prevent my Linux machine from crashing by the use of
> memory_limit, but is does not seem to work as I expect it to: When a
> php-script includes itself recursively by accident it grabbes all memory
> available in a matter of seconds, although I set max_execution_time=30
> and memory_limit=8388608. After 30 seconds of execution the apache
> terminates the request, but the script keeps on running and allocating
> memory (far more than 8 MB). Do I misunderstand the memory_limit option?
> Is there an other way to limit memory usage besides system wide memory
> quotas?
The granularity of the PHP memory limit is rather coarse -- It only checks
for available RAM at specific times.
It's not really designed to stop somebody from doing something quite that,
err, well, silly. (Or perhaps malicioius?) It's more of a convenience for
beginning scripters to not kill themselves with infinite loops.
Also, the memory quota was broken in some not-too-old versions of PHP.
Check your version and search http://bugs.php.net
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