如何设置出生日期输入的验证规则

Question

How can I set date of birth validations for a registration form?

I tried comparing the dob entered with the current date but it didn't work.

if (date("d/m/y") > $dob){
    echo "impossible";
}

or better how can i make it so that the user doesn't have the option to pick a date that hasn't come yet.

Also how can i compare the dates to not allow someone under 12 to join my website?

Answer 1

I managed to do this seeing as i don't want to use jquery for this

if (isset($_POST['button'])){
   $dob = $_POST['dob'];

   echo $dob."<br>".date("o-m-d");

   if (date("o-m-d") < $dob){
       echo "<br>invalid dob";
   } else echo "<br>valid dob";
}

When I pick 31/01/2016 the script gives

2016-01-31
2016-01-09
invalid dob