In PHP, is there an easy way to get the first and last date of a month?

Question

I need to get the first and last day of a month in the format YYYY-MM-DD given only the month and year. Is there a good, easy way to do this?

Answer 1

By the way @ZombieSheep solution

date ('Y-m-d', mktime(0,0,0,$MM + 1,-1,$YYYY));

does not work it should be

date ('Y-m-d', mktime(0,0,0,$MM + 1,0,$YYYY)); // Day zero instead of -1

Of course @Michał Słaby's accepted solution is the simplest.