PHP calculating number of days between 2 dates

Question

I am developing a web application which revolves around dates.

I need to calculate numbers based around days elasped, for example - pseudo code

$coun         


        

Answer 1

Just a bit faster approach than "iterating through all days":

$count_only = array(1, 3, 5); // days numbers from getdate() function
$start_date = 1298572294;
$finish_date = 1314210695;

function days($start_date, $finish_date, $count_only)
{
    $cnt = 0;

    // iterate over 7 days
    for ($deltaDays = 0; $deltaDays < 7; $deltaDays++)
    {
        $rangeStart = $start_date + $deltaDays * 86400;

        // check the weekday of rangeStart
        $d = getDate($rangeStart);
        if (in_array($d['wday'], $count_only))
        {
            $cnt += ceil(($finish_date - $rangeStart) / 604800);
        }
    }

    return $cnt;
}

The idea is to count number of weeks using some additional offsets for mondays, tuesdays, wednesdays etc.