php根据年月日计算年龄

<?
function getAgeByBirth($birth_year,$birth_month,$birth_day){

  if(empty($birth_year) || empty($birth_month) || empty($birth_day)){

    return 0;

  }

  $current_year = date('Y',time());

  $current_month = date('m',time());

  $current_day = date('d',time());

  if($birth_year >= $current_year){

    return 0;

  }

  $age = $current_year - $birth_year - 1;

  if($current_month>$birth_month){

    return $age+1;

  }else if($current_month == $birth_month && $current_day>=$birth_day){

    return $age+1;

  }else{

    return $age;

  }

}

//测试：

echo getAgeByBirth('1988','4','8');

?>