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Get rid of Warning: division by zero on line..
Php is a great language because it allows you to create great web application
but it may be useful even for calculations. Php is often used creating graphics
on the fly starting from simple data.
If you’re projecting a script tide up with math you may encounter a
typical error that come out when you try to divide a number by zero.
The result of such operation would be a “number” that leads to infinite so, for this reason, php returns a warning. If this warning if print on screen or not it depends by your php.ini configuration that may be set on E_ALL or not.
The problems starts if you cannot edit the php.ini file like on remote servers that are not completely under your control.
Let’s avoid the problem.
To test the Warning we need two values. Simply an $a set to 5 (or any other value) and $b set to 0. $c stores the result of the division :)
<?php
$a = 5;
$b = 0;
$c = ($a/$b);
echo $c;
?>
And that’s our warning
Warning: Division by zero in […] on line …
Believe it or not this is a very common mistake across the web even in professional application. Make a search with the keywords above and see it yourself.
To prevent the warning output we’ll use @
@ tells to php.. do not print/output nothing in case of errors, warning and
so on..
edit this way: @($a/$b)
<?php
$a = 5;
$b = 0;
$c = @($a/$b);
echo $c;
?>
No output at all. Well this result may be useful or not. It depends by the script itself. Usually an output is always needed so not output at all may not be what we want to obtain.
With an if else statement we’ll improve our script.
<?php
$a = 5;
$b = 0;
$c = @($a/$b);
echo $c;
if($c == 0)
{
echo "ops.. zero!";
} else {
// rest of the script here
// assuming that b it’s different from zero.. ;)
}
?>
Consider that you may use this simply code for rating systems when there
are no vote jet.
An average it’s a sum of votes divided by the number of the votes. What
if vote = 0 (i.e. $b = 0)? A great warning.. so use this easy solution and
go ahead..
Hope this help.
