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Dec 04, 2024 am 03:06 AM

PHP Database Connections: Global, Singleton, or Factory – Which is Best?

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$conn = new PDO(...);

function getSomething()
{
    global $conn;
    ...
}

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class DB_Instance
{
    private static $db;

    public static function getDBO()
    {
        if (!self::$db) {
            self::$db = new PDO(...);
        }
        return self::$db;
    }
}

function getSomething()
{
    $conn = DB_Instance::getDBO();
    ...
}

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class ConnectionFactory
{
    private static $factory;
    private $db;

    public static function getFactory()
    {
        if (!self::$factory) {
            self::$factory = new ConnectionFactory(...);
        }
        return self::$factory;
    }

    public function getConnection()
    {
        if (!$this->db) {
            $this->db = new PDO(...);
        }
        return $this->db;
    }
}

function getSomething()
{
    $conn = ConnectionFactory::getFactory()->getConnection();
    ...
}

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