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方法1:
$firstday = mktime(0,0,0,$month,1,$year); //取所给年月的第一天的UNIX时间戳 $days = date(‘t‘,$firstday); //返回指定月份的天数
方法2:
$days = cal_days_in_month(CAL_GREGORIAN, 4, 2013);//返回2003-02的天数
方法3:
$days = date(‘t‘, strtotime($year . ‘-‘ . $month . ‘-01‘));//返回天数
方法4:
$ndays = date("t"); //return the number of days for this month and this year date("j",mktime(0,0,0,$month+1,0,$year));
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原文地址:http://www.cnblogs.com/fyy-888/p/5414192.html