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Posted by Guillermo Rauch on 02/09/05 19:15
On Wed, 9 Feb 2005 08:21:25 -0800 (PST), Richard Lynch <ceo@l-i-e.com> wrote:
> James Taylor wrote:
>
> So finally quit that music thing and got a real job? :-)
>
> [Sorry. I'm sure you've heard them all, but I couldn't resist...]
>
> > I have a set of functions which are potentially dangerous in terms of
> > memory hogging, and need to protect from memory overflow - this is I
> > want to detect when the memory overflow occurs.
> >
> > The manual says that eval() will return false on a fatal error, so I
> > thought I could do something like the following, where it would produce
> > a "O" for each itteration, and when it failed (memory overflow) it would
> > continue and echo the last line. What I get however is this attached to
> > the end.
> >
> > Any advice would be gratefully recieved (and perhaps, the documentation
> > on eval updating if it can not catch all fatal errors)
> >
> > #! /usr/bin/php
> > <?php
> > $y = 0;
> > $str = "";
> > $code = '$str .= $str . "."; return true;';
> > $x = TRUE;
> > while($x != FALSE){
> > $x = eval($code);
> > echo "O";
> > $y ++;
> > }
> > echo "\n $y it's \n\n ". $str;
> > ?>
> >
> > run:
> > $ ./intellirun2.php
> > OOOOOOOOOOOOOOOOOOOOOO
> > Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to
> > allocate 4194305 bytes) in
> > /home/jt/work2/sms/web/stats/intellirun2.php(8) : eval()'d code on line 1
>
> You may or may not have some success by preceding the eval with a @ and/or
> using http://php.net/error_reporting and/or using
> http://php.net/set_error_handler to trap the error.
>
> If you are using PHP 5, a try/catch block may also be useful to consider.
>
> I suspect that eval() DOES return false, once you get the error_reporting
> under control instead of relying on the rather crude default error
> handling.
>
> --
> Like Music?
> http://l-i-e.com/artists.htm
>
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>
>
I think a try catch block wouldn't be enough, as most functions throw
warning messages instead exceptions.
You should set a custom error handler and throw the exception by
yourself, if you want to.
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