DesignPatternsPHP/Creational/Singleton/Singleton.php at flyweight · JavaDevl/DesignPatternsPHP · GitHub

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<?php

namespace DesignPatterns\Creational\Singleton;

/**

* class Singleton.

class Singleton

{

/**

* @var Singleton reference to singleton instance

private static $instance;

/**

* gets the instance via lazy initialization (created on first usage).

* @return self

public static function getInstance()

{

if (null === static::$instance) {

static::$instance = new static();

}

return static::$instance;

}

/**

* is not allowed to call from outside: private!

private function __construct()

{

}

/**

* prevent the instance from being cloned.

* @throws SingletonPatternViolationException

* @return void

final public function __clone()

{

throw new SingletonPatternViolationException('This is a Singleton. Clone is forbidden');

}

/**

* prevent from being unserialized.

* @throws SingletonPatternViolationException

* @return void

final public function __wakeup()

{

throw new SingletonPatternViolationException('This is a Singleton. __wakeup usage is forbidden');

}

DesignPatternsPHP/Creational/Singleton/Singleton.php at flyweight · JavaDevl/DesignPatternsPHP · GitHub

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