How to find the last day of the month from date?

Question

How can I get the last day of the month in PHP?

Given:

$a_date = "2009-11-23" 

I want 2009-11-30; and given

$a_date = "2009-12-23" 

I want 2009-12-31.

Answer 1

t returns the number of days in the month of a given date (see the docs for date):

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