Suppressing PDO Warnings

Question

I\'m trying to display a server status, based upon whether the database can be connected to or not. With the old school mysql_connect() and mysqli_connec

Answer 1

The only thing I can see here, is that you tell PDO to throw exceptions after you have tried to open the connection. That is most likely too late.

What you could do instead, is send that option to the constructor directly using the 4th parameter:

try {
  $opts = array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION);
  $db = new PDO($dbms . ':host=' . $dbhost . ';port=' . $dbport . ';dbname=' . $dbname,
                $dbuser, $dbpasswd, $opts);
} catch(PDOException $e) {
...

That will probably solve your problem.

Edit: If the host name is provided by the user, you could validate it before sending it to the PDO constructor.

For example using:

if (filter_var(gethostbyname($user_provided_host_name), FILTER_VALIDATE_IP)) {
  // valid hostname / ip address
}

That will work for domain names, localhost and ip addresses.