class db{ static private $_instance; public $name='name'; private function __construct(){ } static public function getinstance(){ if(!(self::$_instance instanceof self)){ self::$_instance = new self(); } return self::$_instance; } public function __clone(){ trigger_error('对象不允许被复制',e_user_error); } public function test(){ echo '调用方法成功'; } } //$db = new db(); $db = db::getinstance(); $db_clone = clone $db;
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