the number of weeks in a given year

[luciole135]

I propose a correction of the function validate_date_values ($date_query = array()) of the /wp-includes/date.php file
the following 359 to 361 lines:

$date = new DateTime();
$date-> setISODate ($date_query year?, 53);
$week_count = $date-> format ('W') = '53'? 53: 52;

may be replaced by a single line (without using the class dateTime):

$week_count = date ('W', mktime (0,0,0,12,28,$date_query year?));

This speeds up the execution of about 1/100 sec because it greatly simplifies the calculations.

Indeed, the number of weeks in a given year is equal to the corresponding week number of 28 December.
​http://en.Wikipedia.org/wiki/ISO_week_date

[morganestes]

Duplicate of #30845.