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Week number in PHP

Getting the week number for a date in PHP is simple. Just use the powerful date() function that takes a format string and an optional unix timestamp as arguments. If you omit the second argument, it returns the current date/time in the given format.

Example

Get the current week number and print it.

$currentWeekNumber = date('W');
echo 'Week number:' . $currentWeekNumber;

Output:

Week number:16