<?php $d = array(); for($i = 0; $i < 30; $i++) $d[] = date("d", strtotime('-'. $i .' days')); ?>
REFERENCES
http://stackoverflow.com/questions/337760/create-an-array-of-the-last-30-days-using-php
<?php $d = array(); for($i = 0; $i < 30; $i++) $d[] = date("d", strtotime('-'. $i .' days')); ?>