php根据生日计算年龄的方法

本文实例讲述了php根据生日计算年龄的方法。分享给大家供大家参考。具体如下：

    <?php 
    function birthday($birthday){ 
     $age = strtotime($birthday); 
     if($age === false){ 
      return false; 
     } 
     list($y1,$m1,$d1) = explode("-",date("Y-m-d",$age)); 
     $now = strtotime("now"); 
     list($y2,$m2,$d2) = explode("-",date("Y-m-d",$now)); 
     $age = $y2 - $y1; 
     if((int)($m2.$d2) < (int)($m1.$d1)) 
      $age -= 1; 
     return $age; 
    } 
    echo birthday('1986-07-22'); 
    ?>

再来个简单点的，感觉没有上面的高大上

    <?php
    echo birthday("1989-01-25");
    function birthday2($birthday){
      list($year,$month,$day) = explode("-",$birthday);
      $year_diff = date("Y") - $year;
      $month_diff = date("m") - $month;
      $day_diff  = date("d") - $day;
      if ($day_diff < 0 || $month_diff < 0)
       $year_diff--;
      return $year_diff;
    }

希望本文所述对大家的php程序设计有所帮助。