vBulletin Manual

Braces should be placed on a new line in all cases.

if ($condition_one)
{
    // do something
}
else if ($condition_two)
{
    // do something else
}
else
{
    // don't do anything
}

Always use braces, even for loops / branches that contain just a single line of code.

if ($condition_one)
    // do something
else
    if ($condition_two)
        // do something else
    else
        // don't do anything
        
if ($condition_one)
{
    // do something
}
else
{
    if ($condition_two)
    {
        // do something else
    }
    else
    {
        // don't do anything
    }
}