//获取某个月的最后一天或某个月的天数function getmonthlastday ( $month, $year ){ switch ( $month ) { case 4 : case 6 : case 9 : case 11 : $days = 30; break; case 2 : if ( $year % 4 == 0 ) { if ( $year % 100 == 0 ) { $days = $year % 400 == 0 ? 29 : 28; } else { $days = 29; } } else { $days = 28; } break; default : $days = 31; break; } return $days;}
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