[PHP][Help] Registration form age verification

[Kaz]

Basically once a user registers i want it to make sure that they are a required age to register, however im unsure how this works, im wanting it to return an error if they are too young.
Parts of my scripts are below

Heres the part of my form:

<b>Birthdate:</b><br />
                                <select name="day" id="day">
                                <?php echo $dayOptions; ?> </select>
                                <select name="month" id="month" onChange="updateDays();">
                                <?php echo $monthOptions; ?> </select>
                                <select name="year" id="year" onChange="updateDays();">
                                <?php echo $yearOptions; ?> </select> <br /><br />

The var which inserts into the database(this works and inserts):

$dob = "{$_POST['year']}-{$_POST['month']}-{$_POST['day']}";

Im wanting the error to return if the person is under 13 years old

Any help into how i would do this is appreciated

Thanks

 

[Alam]

if ($dob)<13)
{
  echo "You are too young to register";
}
else
{
....
}

I am not completely sure if $dob will represent the whole age , if it doesn't you at least got the idea of how will the data align.

 

[brsy]

I know a PHP if statement would be used, but I am not sure...

 

[Kaz]

I know a PHP if statement would be used, but I am not sure...

ik that, i wasnt sure about the rest and thanks alam it worked fine after adding a few bits to it

 

[Markshall]

This isn't very precise, but what about something like:

<?php
if ( $year < 2000 )
{
    echo 'You must be 13 to register to this site.';
}
?>

 

[RastaLulz]

You could do:

<?php

$timestamp = strtotime('-13 years');

if($year > date('Y', $timestamp) && $month > date('n', $timestamp) && $day > date('j', $timestamp)) {

    echo 'Y U SUUUUU YOUNG?';

}

 

[Kaz]

I ended up recoding it to this:

$dob = "{$_POST['year']}-{$_POST['month']}-{$_POST['day']}";
   
    // Has the user filled in Date of Birth?
    $birth = strtotime($dob);
    $min = strtotime('+13 years', $birth);
    if(time() < $min)
      {
        $errors[12] = "You must be atleast 13 years old to register!";
      }

The code alam gave me worked but didnt work as i wanted it to.
However the above code works perfectly

 

[Markshall]

I don't understand the $dob variable, when I subtract them dates I get 1970 (1994-6-18).

Also, you don't need to do '$errors[12] = ', you can do '$errors[] = '.

 

[Kaz]

I don't understand the $dob variable, when I subtract them dates I get 1970 (1994-6-18).

Also, you don't need to do '$errors[12] = ', you can do '$errors[] = '.

The $dob was orginally used to insert into the database, as the registration form has 3 drop down forms (day/month/year)
I then decided i would use that to get the persons age, and return the error if they are younger

It all works, if i test it out on register, if i put birthday as 6th feb 1999 (not 13 till 2mz) it returns the error
If i put todays date and before (which makes them older) no error returns.