With just a quick handy code snippet posted on his blog today, Derick Rethans shares these two lines to help grab the start and end dates of a week in question.
A friend asked "How do I calculate start (monday) and end (sunday) dates from a given week number for a specified year?" Instead of having to come up with your own algorithm you can simply do the following in PHP 5.1 and higher.
The code makes use of the ISO8601 datetime functionality to grab the correct value from a strtotime command. Derick also briefly explains how it all works.