How can I get specific dates from a number of weeks? - php

Question

Using PHP, I'd like to get the dates for specific weekdays within a given number of weeks. For example, I want to get the dates for Monday, Wednesday and Friday from 10 weeks.
The pseudo code for what I want is like this:
function (monday, wednesday, friday, 10) {
// 10 is week numbers
week1 5,7,9 oct 2015
week2 12,14,16 oct 2015
...
week10
}
i write a solution for this. Thanks for all answers.
<?
$dates = array();
$i = 0;
while(true) {
$i++;
$time = strtotime("+$i days");
$dayOfWeek = date('w', $time);
if(
/*
0-sun
1-mon***
2-tue
3-wed***
4-thu
5-fri***
6-sat
*/
($dayOfWeek == 0) or
($dayOfWeek == 2) or
($dayOfWeek == 4) or
($dayOfWeek == 6)
) {
continue;
}
$dates[] = date('Y-m-d', $time);
if( count($dates) > 30 ) {
break;
}
echo json_encode($dates );
}
?>

Answer 1

Sounds like you want to work with schedules. I suggest you to have a look at library called When, it's "Date / Calendar recursion library for PHP 5.3+".
What you want to do is MWF schedule for next 10 weeks:
$now = new DateTime('NOW');
$after10Weeks = clone $now;
$after10Weeks->modify('+10 week');
$r = new When();
$r->startDate($now)
->freq("weekly")
->until($after10Weeks)
->byday(array('MO', 'WE', 'FR'))
->generateOccurrences();
$occurrences = $r->occurrences;

Answer 2

Use PHP DateTime ISO date:
$date = new DateTime(); //The object
$year=2015; // Desired year
$days = array('Mon', 'Wed', 'Fri'); // Desired days of week
for ($yearDay=1; $yearDay<=366; $yearDay++) {
$date->setISODate($year,null, $yearDay); // call ISO Date
$week=$date->format('W'); // Get the week resulted
$day=$date->format('D'); // Get the day name resulted
if($week==10 && in_array($day, $days)) // return only dates of desired days of week 10
echo $date->format('M d Y')."<br>";
}
More information about ISO Date here
You can try this code with PHPTester