- var_dump: documentation ( source)
- mktime: documentation ( source)
- date: documentation ( source)
- strtotime: documentation ( source)
<?php
$time = 1456034400;
$firstDay = strtotime('first Sunday of '.date('M',$time).' '.date('Y', $time));
$lastDay = mktime(0,0,0,date('m',$time)+1,1,date('Y', $time));
$weekdays = array();
for ($i = $firstDay; $i < $lastDay; $i += 7*24*3600){
$weekdays[] = date('d',$i);
}
var_dump($weekdays);