Question

I have users in a MySQL database, where their birthdays are stored in a DATE format (yyyy-mm-dd). I want to select users in the database with PHP who are between a certain age range.

What I have is a minimum age(18) and a maximum age(21). I know I can do something with BETWEEN, but the problem is that I only know the years and not the dates.

Does anyone have a suggestion on how I can do this?

This is what I’m doing currently:

function leeftijden($age) { 
    $morgen['day']   = date('d'); 
    $morgen['month'] = date('m'); 
    $morgen['year']  = date('Y') - $age;

    $datum = $morgen['year'] .'-' .$morgen['month'].'-' .$morgen['day'];

    return $datum;
}

Then I do this:

$maxDatum = leeftijden(18);
$minDatum = leeftijden(32);
$sqlRijder = "SELECT * FROM rijder WHERE geboortedatum between '".$minDatum."' AND '".$maxDatum."'";

But this doesn’t work 100%.

How can I only select users who are between 18 and 21 years of age?

Answer 1

You can simply do it right in the query:

SELECT * 
FROM rijder 
WHERE geboortedatum BETWEEN 
    CURDATE() - INTERVAL 21 YEAR AND 
    CURDATE() - INTERVAL 18 YEAR

This way, you do not need a special PHP function to construct a DATE string. Simply pass in the numbers and MySQL will make the comparisons for you. Just make sure the higher number comes first in the BETWEEN.