<?php
/**
 * 获取指定月份的第一天开始和最后一天结束的时间戳
 *
 * @param int $y 年份 $m 月份
 * @return array(本月开始时间，本月结束时间)
 */
function mFristAndLast($y = "", $m = ""){
	if ($y == "") $y = date("Y");
	if ($m == "") $m = date("m");
	$m = sprintf("%02d", intval($m));
	$y = str_pad(intval($y), 4, "0", STR_PAD_RIGHT);

	$m>12 || $m<1 ? $m=1 : $m=$m;
	$firstday = strtotime($y . $m . "01000000");
	$firstdaystr = date("Y-m-01", $firstday);
	$lastday = strtotime(date('Y-m-d 23:59:59', strtotime("$firstdaystr +1 month -1 day")));

	return array(
		"firstday" => $firstday,
		"lastday" => $lastday
	);
}
?>