Online PHP editor | refs for 51XMD

<?php $start = new DateTime('2009-10-11'); $end = new DateTime('2010-12-23'); $diff = $end->diff($start); $months = ($diff->y * 12) + $diff->m; $rollup = 0; var_dump("months: $months"); while ($months-- > 0) { echo "rollup: $rollup".PHP_EOL; $rollup += $rollup ?: 500; } var_dump("result: $rollup");