how can i calculate date not less than 18 - php

Question

I am trying to find the date not less than 18 years, I tried this following code, but its not working for me.
// validate birthday
function validateAge($then, $min)
{
// $then will first be a string-date
$then = strtotime($then);
echo "<br>";
echo 'test1-';
var_dump( $then );
exit;
//The age to be over, over +18
$min = strtotime('+18 years', $then);
if(time() < $min) {
die('Not 18');
}
}
$res = validateAge('2016-02-29', $min = 18);
var_dump($res);
I fyou see the above question, you can see that, date is not valid, even if i pass the wrong date, its shows the $then = strtotime($then);
var_dump($then) show the int
my question is, how its printing the timestamp, event if we passing the invalid date.

Answer 1

Your logic is correct. Remove die, exit and echo which is not needed
function validateAge($then, $min)
{
// $then will first be a string-date
$then = strtotime($then);
//The age to be more then min years
$min = strtotime('+'. $min . ' years', $then);
return time() > $min;
}
$res = validateAge('2016-02-29', $min = 18);
echo $res ? 'O\'key' : "Not $min years";
demo

Answer 2

Try maybe something like this
function compareAge($date,$min=18)
{
$strdate = strtotime($date);
$curdate = strtotime("today");
$datefin=date("Ymd",$curdate)-date("Ymd",$strdate);
$age=substr($datefin,0,strlen($datefin)-4);
return $age>=$min;
}
var_dump(compareAge("2013-05-13"));
DEMO

Answer 3

you could use this method:
public function validateAge($then)
{
$then= date_create($then);
$now = date_create("now");
$diff = $now->diff($then);
if ($diff->y > 18)
{
die('not 18');
}
}
Duplicate:
Calculating number of years between 2 dates in PHP

Answer 4

use the datetime object to save all sorts of pain. Its so much more simple.
function validateAge(DateTime $then, $min = 18)
{
$now = new DateTime();
$minimum = clone($now); // you could just modify now, but this is simpler to explain
$minimum->modify("-$min years");
if($then < $minimum) {
return false;
}
return true;
}
echo validateAge(new DateTime('1-1-1997')) ? 'true' : 'false'; // returns false
echo validateAge(new DateTime('1-1-1999')) ? 'true' : 'false'; // returns true
see example

Answer 5

Wow, so many try-hards.
In case you like is simple:
<?php
function validateAge($date) {
return date_create('18 years ago') > date_create($date);
}
var_dump(
validateAge('2010-10-05'),
validateAge('1992-09-02')
);
OUTPUT
bool(false)
bool(true)
Play with me on 3v4l.org
Edit: Also works with the $min parameter:
<?php
function validateAge($date, $min) {
return date_create("$min years ago") > date_create($date);
}
var_dump(
validateAge('2010-10-05', 18),
validateAge('1992-09-02', 18)
);