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方便未来扩展,设计成工厂模式。如果已经使用的类内部发生改变,哪不需要在所有的地方都改变,只需要在类工厂类里改变既可,
interface Mysql{ public function connect(); } class Mysqli2 implements Mysql{ public function connect() { // TODO: Implement connect() method. echo "mysql2"; } } class Pdo implements Mysql{ public function connect() { // TODO: Implement connect() method. echo "pdo"; } } class MysqlFactory { static public function factory($className) { return new $className(); } }
class Factory { static private $instance; private function __construct(){} private function __clone(){} public function test() { echo "单例测试"; } static public function getInstance() { if (!self::$instance instanceof self) { self::$instance = new self(); } return self::$instance; } }
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