PHP if statement "broken" when checking on row

I can't get an IF-statement to do the "right" thing, the code;

public function getUID($email)
{
    $query = $this->dbh->prepare("SELECT id FROM users WHERE email = ?");
    $query->execute(array($email));

    $row = $query->fetch(\PDO::FETCH_ASSOC);

    alert($row, true);           // array(1) { ["id"]=> string(1) "0" }
    alert(is_array($row), true); // bool(true)
    alert($row == false, true);  // bool(false)
    if( $row == false ) {
        // Here we are!
        return false;
    }

    return $row['id'];
}

For some reason the if-statement thinks the result is true, and I can't understand why :[] The output from the sql-command seems correct, we should get an id-entry that is 0...

When writing this question I thought about dropping this question and comparing $row to NULL instead. but that isn't helping. It still goes to return false...