本文实例讲述了PHP常用函数之根据生日计算年龄功能。分享给大家供大家参考，具体如下：
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/**
* 根据出生年月日计算出年龄
* @param $birth_year
* @param $birth_month
* @param $birth_day
* @return int
*/
function getAgeByBirth($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','8','8');
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运行结果：
31
希望本文所述对大家PHP程序设计有所帮助。
原文链接：https://www.cnblogs.com/gyfluck/p/8521197.html