php - Division by zero error in votes

This should work for you:

(It's testing if $total_voting is zero and returns in this case false)

function percent($liked, $total_voting) {
    if($total_voting == 0)
        return false;
    $liked = (int)$liked;
    $total_voting = (int)$total_voting;
    return ceil(($liked/$total_voting)*100);
}