通过身份证判断一个人是否成年，主要困难和不注意到的地方，就是不同人18周岁，这之间的闰年，导致天数会不一样
/*** 是否成年* @param $IDCard* @return int 0 成年，1未成年*/public static function is_adult($IDCard){$flag = 0;if(strlen($IDCard)==18){$tyear=intval(substr($IDCard,6,4));$tmonth=intval(substr($IDCard,10,2));$tday=intval(substr($IDCard,12,2));if($tyear>date("Y")||$tyear<(date("Y")-100)){$flag=0;}elseif($tmonth<0||$tmonth>12){$flag=0;}elseif($tday<0||$tday>31){$flag=0;}else{$day_sum = self::full_year_day($tyear,$tmonth,18);if((time()-mktime(0,0,0,$tmonth,$tday,$tyear))>$day_sum*24*60*60){$flag=0;}else{$flag=1;}}}elseif(strlen($IDCard)==15){$tyear=intval("19".substr($IDCard,6,2));$tmonth=intval(substr($IDCard,8,2));$tday=intval(substr($IDCard,10,2));if($tyear>date("Y")||$tyear<(date("Y")-100)){$flag=0;}elseif($tmonth<0||$tmonth>12){$flag=0;}elseif($tday<0||$tday>31){$flag=0;}else{$day_sum = self::full_year_day($tyear,$tmonth,18);if((time()-mktime(0,0,0,$tmonth,$tday,$tyear))>$day_sum*24*60*60){$flag=0;}else{$flag=1;}}}return $flag;}/*** n周岁的天数* @param $tyear* @param $tmonth* @return int*/public static function full_year_day($tyear,$tmonth,$type=18){$sum=365*$type;for($i=$tyear+1;$i<$tyear+$type;$i++)//考虑中间年份{if(self::is_leap_year($i))$sum++;}if(self::is_leap_year($tyear)&&$tmonth<=2)//考虑初末两年$sum++;if(self::is_leap_year($tyear+$type)&&$tmonth>=3){$sum++;}return $sum;}/*** @param $year* @return int 1是闰年，0不是闰年*/public static function is_leap_year($year){if(($year%4==0&&$year%100!=0)||$year%400==0)return 1;elsereturn 0;}
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