<?phpfunction getthemonth($date){$firstday = date('Y-m-01', strtotime($date));$nowday = date('Y-m-d', strtotime($date));$lastday = date('Y-m-d', strtotime("$firstday +1 month -1 day"));return array($firstday,$nowday,$lastday);}$today = date("Y-m-d");$day=getthemonth($today);echo "当月的第一天: ".$day[0]." 当天日期: ".$day[1]." 当月的最后一天: ".$day[2];echo "<br/>";if($day[0] == $day[1]){echo '今天的日期是当月的第一天';}else{$num = explode('-',$day[1]);echo '今天的日期不是当月的第一天,而是第'.$num[2].'天';}?>
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