PHP: Week starts on Monday, but “monday this week” on a Sunday gets Monday next week

Question

Here\'s a summary of the issue: On Sundays, strtotime(\'this week\') returns the start of next week.

In PHP, the week seems to start on Monday. But, on

Answer 1

This is for thos looking for a friendly solution that works with any day.

function getWeekStart($week_start_day = "Monday") {
    $week_days = array("Sunday"=>0,"Monday"=>1,"Tuesday"=>2,"Wednesday"=>3,"Thursday"=>4,"Friday"=>5,"Saturday"=>6,);

    if(!isset($week_days[$week_start_day])) {
        return false;
    } else {
        $start_day = $week_days[$week_start_day];

        $today = date("w");
        $one_day = (60 * 60 * 24);

        if($today < $start_day) {
            $days_difference = 7 - ($start_day - $today);
        } else {
            $days_difference = ($today - $start_day);
        }

        $week_starts = strtotime(date("Y-m-d 00:00:00")) - ($one_day * $days_difference);

        return $week_starts;
    }
}

//Test: If today is Monday, it will return today's date
echo date("Y-m-d H:i:s", getWeekStart("Monday"));