php instance code for calculating age based on id number

<?php 

function getAgeByID($id){ 

        

// It's too much after this year's birthday 1 One full year of life  

        if(empty($id)) return ''; 

        $date=strtotime(substr($id,6,8));

// Gets a timestamp of the year, month and day of birth  

        $today=strtotime('today');

// Get today's timestamp  

        $diff=floor(($today-$date)/86400/365);

// Get the approximate number of years between the two dates  

        

//strtotime Add this number of years and you get the time stamp of that day compared to the time stamp of today  

        $age=strtotime(substr($id,6,8).' +'.$diff.'years')>$today?($diff+1):$diff; 

  

        return $age; 

    } 

?>

In addition, the website also provides the following tools for the identification number verification:

http://tools.ofstack.com/bianmin/sfz