Php部门不工作[关闭]

For some reason when ever I compile this code, it gives me zero. Why is this?

$aou = 5; //Amount of upvotes
$aod = 2; //Amount of downvotes
$elo = (auo/aod) * 150; //Elo
echo "Your elo is: " . $elo;

The problem is that you type auo and aod instead of $auo and $aod. PHP is trying to look up constants of those names, and not variables.

Constants are defined and used without the dollar sign, e.g.

const FOO = 123;
echo FOO;

But variables need $ every time you use them, thus

$bar = 123;
echo $bar;