php last day of month

1$lastDay = date('t',strtotime('last month'));
2
3print_r($lastDay);

1$lastDateOfNextMonth =strtotime('last day of next month') ;
2
3$lastDay = date('d/m/Y', $lastDateOfNextMonth);
4
5 
6
7print_r($lastDay);

1$a_date = "2009-11-23";
2echo date("Y-m-t", strtotime($a_date));

1//Last month
2$lastMonth = Date("F", strtotime("first day of previous month");
3$nextMonth = Date("F", strtotime("first day of next month");

1if(gmdate('t') == gmdate('d')){
2    echo 'Last day of the month.';
3}