当月开始结束时间

/*** 获取上个月开始结束时间* @param string $format*/
function getTime($format = '20190104')
{date_default_timezone_set('Asia/Shanghai');$i = strtotime($format);$Y = date('Y', $i);$m = date('m', $i);if ($m == 01) {$m = 12;$Y -= 1;}$beginThismonth=mktime(0,0,0,$m,1,$Y);$endThismonth=mktime(23,59,59,$m,date('t', $i),$Y);echo $beginThismonth.' --- '.$endThismonth;
}getTime();