PHP operates dates and strings to accurately calculate age

This article mainly introduces PHP to operate dates and strings to accurately calculate age. Friends who are interested can refer to it. I hope it will be helpful to everyone.

The code is as follows:

<?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(&#39;-&#39;, $birthday);
    list($year, $month, $day) = explode(&#39;-&#39;, date(&#39;Y-m-d&#39;));
    $bmonth = intval($bmonth);
    $bday = intval($bday);
    if ($bmonth < 10) {
      $bmonth = &#39;0&#39; . $bmonth;
    }
    if ($bday < 10) {
      $bday = &#39;0&#39; . $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(&#39;year&#39; => $years, &#39;month&#39; => $m, &#39;day&#39; => $d, &#39;not_birth&#39; => $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();
$test = array(
  &#39;1990-06-12&#39;,
  &#39;1990-07-13&#39;,
  &#39;1990-08-16&#39;,
  &#39;1990-10-10&#39;,
  &#39;1990-10-13&#39;,
  &#39;1990-10-15&#39;,
  &#39;1990-11-9&#39;,
  &#39;1990-11-22&#39;,
  &#39;2016-11-22&#39;,
  &#39;2016-8-22&#39;,
  &#39;2016-10-13&#39;,
);
echo date(&#39;Y-m-d&#39;);
echo &#39;<pre class="brush:php;toolbar:false">&#39;;
foreach($test as $v){
  $tmp = $cage->calAge($v);
  echo $v , &#39;:&#39;, $tmp[&#39;year&#39;], &#39;年&#39;, $tmp[&#39;month&#39;],
 &#39;月&#39;, $tmp[&#39;day&#39;], &#39;天&#39;, &#39;;&#39;, $tmp[&#39;not_birth&#39;], &#39;<br>&#39;;
}
echo &#39;

' ;     /*   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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