Php calculates the age based on the ID card number

The code is as follows:

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<? Php Function getAgeByID ($ id ){         // After this year's birthday, you will be 1 year old. If (empty ($ id) return ''; $ Date = strtotime (substr ($ id, 6, 8 )); // Obtain the date of birth, month, and day $ Today = strtotime ('today '); // Obtain the timestamp of today $ Diff = floor ($ today-$ date)/86400/365 ); // Obtain the approximate number of years of difference between the two dates         // After strtotime is added with this number of years, get the timestamp of that day and compare it with today's timestamp. $ Age = strtotime (substr ($ id, 6, 8). '+'. $ diff. 'Ears')> $ today? ($ Diff + 1): $ diff;   Return $ age;     } ?>