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<?php class Mysql{ //static self public static $db; public static function getInstance(){ if(! isset(self::$db)) { self::$db=new self(); } return self::$db; } private function __construct() { } function connect(){ echo 'you are connect yo db'; } } // Mysql::$db; // $db1 = new Mysql(); // $db2 = new Mysql(); // $db1->connect(); // $db2->connect(); $db=Mysql::getInstance(); $db->connect(); $db1 = Mysql::getInstance(); $db1->connect();
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