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PHPで指定月の月初と月末の日付を取得

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PHPで指定月の月初と月末の日付を取得するTips。
意外とすぐ出てこなかったので残しておきます。

sample.php
$month = '2014-03'; //nullでも構いません
$firstDate = date('Y-m-d', strtotime('first day of ' . $month));
$lastDate = date('Y-m-d', strtotime('last day of ' . $month));

\$monthがnullの場合には、現在月の月初と月末を取得してくれます。

詳しい解説

http://php.net/manual/ja/datetime.formats.relative.php
↑公式リファレンス

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