How to find the date of a day of the week from a date using PHP ?

Here is the code, this works fine.

$dayofweek = date('w', strtotime($date));
$result = date('Y-m-d', strtotime(($day - $dayofweek).' day', strtotime($date)));

We have to use the date() function through the following two ways.

date('w'); // day of week

or

date('l'); // dayname

Here is the example function for get the day nr,

function getWeekday($date) {
    return date('w', strtotime($date));
}
 
echo getWeekday('2012-10-11'); // returns 4

One can use this code and find the date of a day of the week from a date.

$date = '2012-10-11';
$day = 1;
$days = array('Sunday', 'Monday', 'Tuesday', 'Wednesday','Thursday','Friday', 'Saturday');
echo date('Y-m-d', strtotime($days[$day], strtotime($date)));