Get the date of next monday, tuesday, etc

I know it's a bit of a late answer but I would like to add my answer for future references.

// Create a new DateTime object
$date = new DateTime();

// Modify the date it contains
$date->modify('next monday');

// Output
echo $date->format('Y-m-d');

The nice thing is that you can also do this with dates other than today:

// Create a new DateTime object
$date = new DateTime('2006-05-20');

// Modify the date it contains
$date->modify('next monday');

// Output
echo $date->format('Y-m-d');

To make the range:

$monday = new DateTime('monday');

// clone start date
$endDate = clone $monday;

// Add 7 days to start date
$endDate->modify('+7 days');

// Increase with an interval of one day
$dateInterval = new DateInterval('P1D');

$dateRange = new DatePeriod($monday, $dateInterval, $endDate);

foreach ($dateRange as $day) {
    echo $day->format('Y-m-d')."<br />";
}

References

PHP Manual - DateTime

PHP Manual - DateInterval

PHP Manual - DatePeriod

PHP Manual - clone

See strtotime()

strtotime('next tuesday');

You could probably find out if you have gone past that day by looking at the week number:

$nextTuesday = strtotime('next tuesday');
$weekNo = date('W');
$weekNoNextTuesday = date('W', $nextTuesday);

if ($weekNoNextTuesday != $weekNo) {
    //past tuesday
}