type analysis assumes ($x-1) is always integer type

[jakubmisek]

test:

function f($iSbdSize)
{
    if ($iSbdSize > 0) // makes the assumption
    {
        for ($i = 0; $i < ($iSbdSize - 1); $i++) // treats double as long -> error
        {
            echo $i, '.';
        }
    }
}