get month last and first day even leap year

Get last day of month with php date.

[php]
echo date(‘t’,strtotime(’25-02-2016′));
//its return 29

echo date(‘t’,strtotime(’25-02-2015′));
//its return 28

echo date(‘t’,strtotime(’11-10-2015′));
//its return 30
[/php]

Get Frist day of month.

[php]
echo date(‘D’,strtotime(’01-11-2013′));
//its return 01
[/php]