-
-
/**
- * by bbs.it-home.org
- * 2012-12-26
- */
- class Mysql{
- //该属性用来保存实例
- private static $conn;
- //构造函数为private,防止创建对象
- private function __construct(){
- $this->conn = mysql_connect('localhost','root','');
- }
- //创建一个用来实例化对象的方法
- public static function getInstance(){
- if(!(self::$conn instanceof self)){
- self::$conn = new self;
- }
- return self::$conn;
- }
- //防止对象被复制
- public function __clone(){
- trigger_error('Clone is not allowed !');
- }
}
- //只能这样取得实例,不能new 和 clone
- $mysql = Mysql::getInstance();
- ?>
-
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