当月の開始日、次月の開始日、次月の月末

gistfile1.php

		$startOfThisMonth = date('Y-m-1', strtotime($from));
		$startOfNextMonth = date('Y-m-d', strtotime($startOfThisMonth.' +1 month')) ; 
		$endOfNextMonth   = date('Y-m-t', strtotime($startOfNextMonth));