$username = "123";
$password = "123";
$host = "localhost";
$dbname = "123";

try {
$dbh = new PDO('mysql:host=localhost;dbname=123', $username, $password);
$dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
echo "Connected";

}
catch(PDOException $e) {
    echo "I'm sorry Charlie, I'm afraid i cant do that.";
    file_put_contents('PDOErrors.txt', $e->getMessage(), FILE_APPEND);
    $dbh = null;
}