How to find a start date & end date of any given year & month

Question

I have problem in php find start date & end date of month & year , when i know the year and month ?

ex:

input - > year = 2011 , month = 0         


        

Answer 1

$year = '2017';
$month = '05';
echo date("$year-$month-01");
echo "
";
echo date("$year-$month-t");

shortest solution in my own opinion.