check when PDO Fetch select statement returns null

Question

I have the following code:

  $check = $dbh->prepare(\"SELECT * FROM BetaTesterList WHERE EMAIL = ?\");
                $check->execute(array($email));
         


        

Answer 1

$res should look something like this:

array (
    [0] => array (
        [column1] => value,
        [email] => value
    ),
    [1] => array (
        [column1] => value,
        [email] => value
    ),
    [2] => array (
        [column1] => value,
        [email] => value
    )
)

Therefore, if(!($res['email')) will always evaluate to true because $res['email'] is undefined (null, I suppose) and it is negated. So, negation of a negation = true :).