RE: [PHP] suppressing division by zero errors

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 -----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