RE: [PHP] suppressing division by zero errors

On Thu, 2002-01-31 at 15:26, Martin Towell wrote: > I was thinking of writing a _very simple_ graphing program - enter an > expression and php will generate an image with the graph on it, I didn't > want to spend too much time parsing the expression up and seeing if there's > a division or anything else that may cause an error/warning [eg tan(PI/2), > etc] > > I know there's probably loads of code already written to do what I'm > thinking of doing, but there's no substitute in starting from scratch and > getting something working yourself.... :) > > Thanks Torben, that helped. > > Martin Just to warn you, I just checked this on PHP 4.0.3pl1 and it doesn't appear to suppress the warning, for some reason. Works on 4.2.0-dev though... Torben > -----Original Message----- > From: Christopher William Wesley [mailto:cwwesley@udlug.org] > Sent: Friday, February 01, 2002 10:17 AM > To: php-general@lists.php.net > Cc: Martin Towell > Subject: Re: [PHP] suppressing division by zero errors > > > You really need to do some error checking on the denominator. > $num = 5; > $den = 0; > > echo $den != 0 ? $num/$den : "0"; > > A number divided by zero isn't defined, so you have to circumvent the > situation by making sure it never happens. > > ~Chris /"\ > \ / September 11, 2001 > X We Are All New Yorkers > / \ rm -rf /bin/laden > > On Fri, 1 Feb 2002, Martin Towell wrote: > > > Is there a way to suppress division by zero errors? > > > > echo 5/0; // this give a warning - obviously!! > > > > @echo 5/0; // this gives a parse error > > > > echo @5/0; // this still comes up with a warning > > > > unless I turn error_reporting off before and turn it back on afterwards, > but > > I don't want to do that unless I REALLY have to > > > > Martin > > > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, e-mail: php-general-unsubscribe@lists.php.net > For additional commands, e-mail: php-general-help@lists.php.net > To contact the list administrators, e-mail: php-list-admin@lists.php.net -- Torben Wilson <torben@php.net> http://www.thebuttlesschaps.com http://www.hybrid17.com http://www.inflatableeye.com +1.604.709.0506