Whats wrong with this math

[Napster]

I pull 2 variables out of the db and then I put them into variables.

Lets say they are $var[1] and var[2] and $var[1] = 18 and $var[2]= 5. Now then I go

$cost = $var[1] - $var[2];

and instead of the answer being 13 it is 0, why does it do that.

[LordShryku]

Are you sure of those values? Also, just as a rule of thumb, I usually add parentheses around my math.

$cost = ($var[1] - $var[2]);

[Napster]

my bad, it was something to do with the query codes

[planetsim]

Its a good idea to also do what LordShryku said.. especially when outputting them like this

echo $var-$var2;