php根据生日计算年龄的方法

<?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'); ?>

<?phpecho 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;}