[Calculating days of week given a week number]

code.php

<?php

$week_number = 40; // If the number is less than 10, use '0' as the prefix, eg: 03.
$year = 2008;

for($day=1; $day<=7; $day++)
{
    echo date('m/d/Y', strtotime($year."W".$week_number.$day))."\n";
}