zentaopms/lib/spout/Common/Singleton.php
2023-05-16 10:47:08 +08:00

42 lines
704 B
PHP

<?php
namespace Box\Spout\Common;
/**
* Class Singleton
* Defines a class as a singleton.
*
* @package Box\Spout\Common
*/
trait Singleton
{
protected static $instance;
/**
* @return static
*/
final public static function getInstance()
{
return isset(static::$instance)
? static::$instance
: static::$instance = new static;
}
/**
* Singleton constructor.
*/
final private function __construct()
{
$this->init();
}
/**
* Initializes the singleton
* @return void
*/
protected function init() {}
final public function __wakeup() {}
final public function __clone() {}
}