php get the first and last day of each month instance

Example, php gets the first and last day of each month. PHP date function date usage.

function getthemonth($date)
{
$firstday = date('y-m-01', strtotime($date));
$lastday = date('y-m-d', strtotime("$firstday +1 month -1 day"));
return array($firstday,$lastday);
}
$today = date("y-m-d");
$day=getthemonth($today);
 ?>