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PDO::__construct ( string $dsn [, string $username [, string $password [, array $driver_options ]]] )

<?php
/* Creating a PDO instance by calling the driver */
$dsn = 'mysql:dbname=testdb;host=127.0.0.1';
$user = 'dbuser';
$password = 'dbpass';

try {
    $dbh = new PDO($dsn, $user, $password);
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}

?>