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Why do you think it wouldn't work for other errors? It says in the manual It doesn't say it throws on invalid username/password, it says it throws on failure. Invalid username / password is only one of many reasons why the connection attempt might fail.

<?php $host = 'localhost'; // your database host $dbname = 'mydatabase'; // your database name $username = 'myusername'; // your database username $password = 'mypassword'; // your database password try { $pdo = new PDO("mysql:host=$host;dbname=$dbname", $username, $password); $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // set additional PDO attributes if needed } catch (PDOException $e) { echo 'Connection failed: ' . $e->getMessage(); } ?>