1 <?php 2  3 class Multiton 4 { 5     private static $conn = []; 6  7     private function __construct() 8     { 9 10     }11 12     private function __clone()13     {14 15     }16 17     private function __wakeup()18     {19 20     }21 22     public static function getConn($type)23     {24         if (!array_key_exists($type, self::$conn)) {25             self::$conn[$type] = new self();26         }27 28         return self::$conn[$type];29     }30 }