PDO Database Class

class database {
     
    private $dbName = null, $dbHost = null, $dbPass = null, $dbUser = null;
    private static $instance = null;
     
    private function __construct($dbDetails = array()) {
         
        // Please note that this is Private Constructor
         
        $this->dbName = $dbDetails['db_name'];
        $this->dbHost = $dbDetails['db_host'];
        $this->dbUser = $dbDetails['db_user'];
        $this->dbPass = $dbDetails['db_pass'];
 
        // Your Code here to connect to database //
        $this->dbh = new PDO('mysql:host='.$this->dbHost.';dbname='.$this->dbName, $this->dbUser, $this->dbPass);
    }
     
    public static function connect($dbDetails = array()) {
         
        // Check if instance is already exists      
        if(self::$instance == null) {
            self::$instance = new database($dbDetails);
        }
         
        return self::$instance;
         
    }
     
    private function __clone() {
        // Stopping Clonning of Object
    }
     
    private function __wakeup() {
        // Stopping unserialize of object
    }
     
}

Kullanımı:

$dbDetails = array(
        'db_name' => 'designpatterns',
        'db_host' => 'localhost',
        'db_user' => 'root',
        'db_pass' => 'mysqldba'
);
 
$db1 = database::connect($dbDetails);
var_dump($db1);