How to calculate age from a year of birth?

Discussion in 'PHP' started by Divvy, Oct 14, 2015.

0
  1. #1
    Hello guys,

    How could I calculate an person's age if I have their year of birth?

    Im trying this function:

    function age_in_years() {
 global $postmeta;
 $year_of_birth = get_field( "date_of_birth",$modelID);
 $date1 = strval( $year_of_birth );
 $date2 = strval( date( 'yy') );
 $age = $date2 = $date1;
 return $age;
}
    PHP:
    But is not working at all... what I am doing wrong?
    Using this code:
    <?php echo age_in_years();?>
    PHP:
    Is getting this:
    05/07/1992
    Code (markup):
    Database screenshot: http://i.imgur.com/mjLrEQx.png


    Waiting for your help, thanks [​IMG]

    Thanks heaps
    Tim
     
    Solved! View solution.
    Divvy, Oct 14, 2015 IP
  2. sarahk

    sarahk iTamer Staff

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    #2
    Have you tried doing it the classic php way

    $from =newDateTime('1970-02-01');
$to =newDateTime('today');
echo $from->diff($to)->y;
    PHP:
     
    sarahk, Oct 14, 2015 IP
  3. Divvy

    Divvy Well-Known Member

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    #3
    Thank you for your reply and help sarahk :)

    Yeah, you are right... that can work!

    But maybe you can hep me... If I have this code to calculate age:
    <?php echo date_diff(date_create('04-08-1967'), date_create('today'))->y; ?>
    PHP:
    And If I have this one to get the birth date:
    <?php echo get_field( "date_of_birth",$modelID); ?>
    PHP:
    I need to replace the '04-08-1967' of 1st code with the 2nd code right?
    But how can I do that? My php knowledge is very poor...

    I tried:
    <?php echo date_diff(date_create('get_field( "date_of_birth",$modelID);'), date_create('today'))->y; ?>
    PHP:
    But without success... Im doing something wrong... help :)

    Thanks!!
     
    Divvy, Oct 15, 2015 IP
  4. #4
    for starters, it's seen as a good thing to have code all on one line but if you have to maintain it later it can be a nightmare. Add to that the fact that you are just learning and it can make really good sense to have several lines

    So I'd do
    
<?php 
$dob = get_field( "date_of_birth",$modelID);
$datedob = date_create($dob);
$today = date_create('today');
echo date_diff($datedob, $today)->y; ?>
    PHP:
    ** untested **
     
    sarahk, Oct 15, 2015 IP
  5. Divvy

    Divvy Well-Known Member

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    #5
    Working perfectly !!!
    What you said makes absolute sense :)

    Thank you very much Sarah!!
     
    Divvy, Oct 15, 2015 IP
  6. PoPSiCLe

    PoPSiCLe Illustrious Member

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    #6
    As a side note, the reason your code didn't work was that you tried putting a function call inside quotes. The idea was pretty close to correct, but the right code would be as this:
    
<?php echo date_diff(date_create(get_field( "date_of_birth",$modelID)), date_create('today'))->y; ?>
    PHP:
    Colored editors should help you here, since they usually have their own color for text inside quotes (strings) and functions, and so on.
     
    PoPSiCLe, Oct 15, 2015 IP
  7. Divvy

    Divvy Well-Known Member

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    #7
    Ohhh great!!! Thank you for the explanation PoPSiCLe ;)
     
    Divvy, Oct 15, 2015 IP