PHP - get last week number in year.

Question

Hello! Tell me please how to get the last number of weeks in a year?

Answer 1

Replace 2010 by the year you want and Europe/Berlin with your timezone:

<?php
    date_default_timezone_set('Europe/Berlin');
    echo gmdate("W", strtotime("31 December 2010"));
?>

You'll get one of the values 01, 52 or 53.

---

Just for fun:

<?php
    date_default_timezone_set('Europe/Berlin');
    for ($year = 1900; $year < 2100; $year++) {
        echo $year . " => " . 
            gmdate("W", strtotime("31 December " . $year)) . "\n";
    }
?>

Answer 2

If you were asking how to get the number of weeks left in the year, this would do it:

<?php

$year = date('Y');

$week_count = date('W', strtotime($year . '-12-31'));

if ($week_count == '01')
{   
    $week_count = date('W', strtotime($year . '-12-24'));
}

echo ($week_count - date('W'));
echo ' weeks left in ' . date('Y') . '!';

?>

Edit: Added logic to compensate for the '01' returned by date('W');