如何使用getdate（）来验证用户的年龄？

Question

When a user attempts to register with my site, I need to verify that they are old enough. I am trying to do this using the getdate() function.

I understand what getdate() does, but I am struggling to understand how to use it correctly for this purpose.

<?php
$fn = $_POST["fullname"];
$un = $_POST["username"];
$pw = $_POST["password"];
$dob = $_POST["dayofbirth"];
$mob = $_POST["monthofbirth"];
$yob = $_POST["yearofbirth"];

$date = getdate();

if ( $yob =$yob>= $date["year"]-16)
{
    echo "Too young to register!";
}
elseif ($yob <=1899)
{
    echo "Don't be silly, you are not that old!";
}
else 
{
    echo "<h1>Thank you for registering with us!</h1>";
    echo "<p> You have successfully registered with these details:
          <br>Your full name :$fn<br> Username: $un 
          <br>Date of birth: $dob $mob $yob</p>";
}
?>

Answer 1

Try:

$registration = new DateTime(implode('-', array($yob, $mob, $dob)));
$now = new DateTime();

var_dump($now->diff($registration)->y);

This will give you the actual age, taking months, days and leap years into account.

DateTime Class Manual