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【PHP】计算年龄精确到天
作者:柠檬爱曾 / 发布于2015/10/19/ 689

	<?php
	
	/*
	* To change this license header, choose License Headers in Project Properties.
	* To change this template file, choose Tools | Templates
	* and open the template in the editor.
	*/
	
	class Age {
	
	 /**
	 * 计算年龄精准到年月日
	 * @param type $birthday
	 * @return array
	 */
	
	 public function calAge($birthday) {
	 list($byear, $bmonth, $bday) = explode('-', $birthday);
	 list($year, $month, $day) = explode('-', date('Y-m-d'));
	 $bmonth = intval($bmonth);
	 $bday = intval($bday);
	 if ($bmonth < 10) {
	 $bmonth = '0' . $bmonth;
	 }
	 if ($bday < 10) {
	 $bday = '0' . $bday;
	 }
	 $bi = intval($byear . $bmonth . $bday);
	 $ni = intval($year . $month . $day);
	 $not_birth = 0;
	 if ($bi > $ni) {
	 $not_birth = 1;
	 $tmp = array($byear, $bmonth, $bday);
	 list($byear, $bmonth, $bday) = array($year, $month, $day);
	 list($year, $month, $day) = $tmp;
	 list($bi, $ni) = array($ni, $bi);
	 }
	 $years = 0;
	 while (($bi + 10000) <= $ni) {//先取岁数
	 $bi += 10000;
	 $years++;
	 $byear++;
	 }//得到岁数后 抛弃年
	 list($m, $d) = $this->getMD(array($year, $month, $day), array($byear, $bmonth, $bday));
	 return array('year' => $years, 'month' => $m, 'day' => $d, 'not_birth' => $not_birth);
	 }
	
	 /**
	 * 只能用于一年内计算
	 * @param type $ymd
	 * @param type $bymd
	 */
	 public function getMD($ymd, $bymd) {
	 list($y, $m, $d) = $ymd;
	 list($by, $bm, $bd) = $bymd;
	 if (($m . $d) < ($bm . $bd)) {
	 $m +=12;
	 }
	 $month = 0;
	 while ((($bm . $bd) + 100) <= ($m . $d)) {
	 $bm++;
	 $month++;
	 }
	 if ($bd <= $d) {//同处一个月
	 $day = $d - $bd;
	 } else {//少一个月
	 $mdays = $bm > 12 ? $this->_getMothDay( ++$by, $bm - 12) : $this->_getMothDay($by, $bm);
	 $day = $mdays - $bd + $d;
	 }
	 return array($month, $day);
	 }
	
	 private function _getMothDay($year, $month) {
	 switch ($month) {
	 case 1:
	 case 3:
	 case 5:
	 case 7:
	 case 8:
	 case 10:
	 case 12:
	 $day = 31;
	 break;
	 case 2:
	 $day = (intval($year % 4) ? 28 : 29); //能被4除尽的为29天其他28天
	 break;
	 default:
	 $day = 30;
	 break;
	 }
	 return $day;
	 }
	
	}
	
	$cage = new Age();
	$test = array(
	 '1990-06-12',
	 '1990-07-13',
	 '1990-08-16',
	 '1990-10-10',
	 '1990-10-13',
	 '1990-10-15',
	 '1990-11-9',
	 '1990-11-22',
	 '2016-11-22',
	 '2016-8-22',
	 '2016-10-13',
	);
	echo date('Y-m-d');
	echo '<pre>';
	foreach($test as $v){
	 $tmp = $cage->calAge($v);
	 echo $v , ':', $tmp['year'], '年', $tmp['month'],
	'月', $tmp['day'], '天', ';', $tmp['not_birth'], '';
	}
	echo '</pre>' ;
	
	
	/*
	 运行结果：
	 2015-10-13
	 1990-06-12:25年4月1天;0
	 1990-07-13:25年3月0天;0
	 1990-08-16:25年1月27天;0
	 1990-10-10:25年0月3天;0
	 1990-10-13:25年0月0天;0
	 1990-10-15:24年11月28天;0
	 1990-11-9:24年11月4天;0
	 1990-11-22:24年10月21天;0
	 2016-11-22:1年1月9天;1
	 2016-8-22:0年10月9天;1
	 2016-10-13:1年0月0天;1
	
	*
	*/
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