php根据出生年月日计算年龄的方法

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方法1:

1. <?php
   
2. 
   
3. function birthday($birthday){
   
4. $age = strtotime($birthday);
   
5. if($age === false){
   
6. return false;
   
7. }
   
8. list($y1,$m1,$d1) = explode("-",date("Y-m-d",$age));
   
9. $now = strtotime("now");
   
10. list($y2,$m2,$d2) = explode("-",date("Y-m-d",$now));
    
11. $age = $y2 - $y1;
    
12. if((int)($m2.$d2) < (int)($m1.$d1))
    
13. $age -= 1;
    
14. return $age;
    
15. }
    
16. echo birthday('1986-07-22');
    
17. ?>

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方法2:

1. <?php
   
2. echo birthday("1989-01-25");
   
3. function birthday2($birthday){
   
4. list($year,$month,$day) = explode("-",$birthday);
   
5. $year_diff = date("Y") - $year;
   
6. $month_diff = date("m") - $month;
   
7. $day_diff  = date("d") - $day;
   
8. if ($day_diff < 0 || $month_diff < 0)
   
9.   $year_diff--;
   
10. return $year_diff;
    
11. }

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