function filesize

// remainder
//echo date('d');

echo fmod(date('d'), 6);
// fmod return the remainder.

// function filesize
function niceSize($size)
{

    define("SIZESTEP", 1024.0);

    static $sizeUnits = Array(" B","KB","MB","GB","TB","PB","EB");

    if($size==="") return "";

    $unitIndex = 0;

    while($size>SIZESTEP)
    {
        $size = $size / SIZESTEP;
        $unitIndex++;
    }

    if($unitIndex==0) {
        return number_format($size, 0)." ".$sizeUnits[$unitIndex];
    } else {
        return number_format($size, 1, ".", ",")." ".$sizeUnits[$unitIndex];
    }
}