PHP计算年龄的函数
今天工作要计算用户的生日到周，找到一个函数。[*]/**
[*] *计算生日到现在的时间
[*] * @param int $birthday 宝贝生日
[*] */
[*] function age($birthday) {
[*] $now = date('Ymd');
[*] //分解当前日期为年月日
[*] $y = (int) ($now / 10000);
[*] $m = (int) (($now % 10000) / 100);
[*] $d = $now % 100;
[*] //分解生日为年月日
[*] $yy = (int) ($birthday / 10000);
[*] $ym = (int) (($birthday % 10000) / 100);
[*] $yd = $birthday % 100;
[*] //特殊日期计算
[*] if ($years % 4 == 0 || ($years % 100 == 0 && $years % 400 == 0)) {
[*] $special = 29;
[*] } else {
[*] $special = 28;
[*] }
[*] //各月的上个月的天数
[*] switch ($m) {
[*] case 2:$add = 31;
[*] case 3:$add = 31;
[*] case 6:$add = 31;
[*] case 8:$add = 31;
[*] case 9:$add = 31;
[*] case 11:$add = 31;
[*] case 1:$add = 31;
[*] case 5:$add = 30;
[*] case 7:$add = 30;
[*] case 10:$add = 30;
[*] case 12:$add = 30;
[*] case 3:$add = $special;
[*] }
[*] if ($d < $yd) {
[*] $d+=$add;
[*] $m-=1;
[*] }
[*] if ($m < $ym) {
[*] $m+=12;
[*] $y-=1;
[*] }
[*] //运算年龄
[*] if ($now >= $birthday) {
[*] $age['day'] = $d - $yd;
[*] $age['month'] = $m - $ym;
[*] $age['year'] = $y - $yy;
[*] return $age;
[*] }else{
[*] return 0;
[*] }
[*] }
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