获取当前月的所有日期

get_days_of_current_month.php

$start  = new \DateTime('first day of this month');
$end    = new \DateTime('first day of this month + 1 month');
$period = new \DatePeriod($start, new \DateInterval('P1D'), $end);

foreach($period as $day){
    // here check if you have records with this date and print them,
    // otherwise print default values
    print $day->format('d.m.Y') . "\n";
}