<?php

$number_of_dates = 10;
$startDate = mktime(0, 0, 0, 5, 2, 2012); // May 2, 2012
for ($i = 0; $i < $number_of_dates; $i++) {
   $date = strtotime('Wednesday +' . ($i * 2) . ' weeks', $startDate);
   echo date('m-d-Y', $date).PHP_EOL;
}