How can one determine the number of calendar weeks in a given year using PHP?

To determine the number of calendar weeks in a given year using PHP, we can use the `W` format character with the `date()` function to get the week number of the last day of the year. By getting the week number of December 31st of the given year, we can determine the total number of weeks in that year.

$year = 2022; // Specify the year for which you want to determine the number of weeks

$lastDayOfYear = strtotime("December 31, $year");
$numberOfWeeks = date("W", $lastDayOfYear);

echo "Number of calendar weeks in $year: $numberOfWeeks";