PHP: Elegant way to avoid division by zero

Question

Much like this site, my current project has reputation and in the script that I\'m working on I need to calculate the ratio between two users\' reputations.

Answer 1

Based upon the other answers I'll assume you only update the ratio if it's not zero (Remember you asked for elegance not clarity):

if( !empty($attacker->rep) ) { 
    $attacker->ratio = $defender->rep / $attacker->rep;
}

PHP treats 0 as empty.