Datetime comparison PHP/Mysql?

Question

I\'m trying to make something like this:

if (datetime - system date > 15 minutes) (false)

if (datetime - system date          


        

Answer 1

the most efficient PHP/MySQL combined solution is:

$date = date('Y-m-d H:i:s', strtotime('-15 minutes'));
$data = $pdo->query("SELECT date_field > '$date' as expired from table")->fetchAll(PDO::FETCH_COLUMN);
foreach($data as $expired) {
    if (!$expired) {
        // Still Valid
    }
}