Mengetahui minggu keberapa pada bulan tertentu

function getWeeks($date, $rollover)
{
    $cut        = substr($date, 0, 8);
    $daylen     = 86400;
    $timestamp  = strtotime($date);
    $first      = strtotime($cut . "01");   
    $elapsed    = (($timestamp - $first) / $daylen)+1;
    $i          = 1;
    $weeks      = 0;
    for($i==1; $i<=$elapsed; $i++)
    {
        $dayfind        = $cut . (strlen($i) < 2 ? '0' . $i : $i);
        $daytimestamp   = strtotime($dayfind);
        $day            = strtolower(date("l", $daytimestamp));
        if($day == strtolower($rollover))
        {
            $weeks++;  
        }
    } 
    if($weeks==0)
    {
        $weeks++; 
    }
    return $weeks;  
}

ex: echo getWeeks("2012-01-27", "sunday");