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@ 2014-02-14T19:05:30Z

<?php

class Singleton
{
    private static $instance = null;

    final private function __construct() {}
    final private function __clone() {}

    public function __wakeup()
    {
        throw new Exception("Cannot unserialize singleton");
    }

    public static function getInstance()
    {
        if (!self::$instance) {
            self::$instance = new self;
        }
        return self::$instance;
    }
}

$oneInstance = Singleton::getInstance();
echo "Cloneable outside:", var_dump((new ReflectionClass('Singleton'))->isCloneable());

$cloner = function () {
    return clone $this;
};

$secondInstance = $cloner->bindTo($oneInstance, 'Singleton');//->__invoke();

// $thirdInstance = clone $oneInstance;

var_dump($secondInstance);

$reflection = new ReflectionClass($secondInstance);

var_dump($reflection->getMethods());

var_dump($reflection->getMethod('bind'));

var_dump($reflection->getMethod('bindTo'));

Output for git.master, git.master_jit, rfc.property-hooks: Warning: Private methods cannot be final as they are never overridden by other classes in /in/kZMuW on line 8 Cloneable outside:bool(false) object(Closure)#3 (1) { ["this"]=> object(Singleton)#1 (0) { } } array(6) { [0]=> object(ReflectionMethod)#5 (2) { ["name"]=> string(11) "__construct" ["class"]=> string(7) "Closure" } [1]=> object(ReflectionMethod)#6 (2) { ["name"]=> string(4) "bind" ["class"]=> string(7) "Closure" } [2]=> object(ReflectionMethod)#7 (2) { ["name"]=> string(6) "bindTo" ["class"]=> string(7) "Closure" } [3]=> object(ReflectionMethod)#8 (2) { ["name"]=> string(4) "call" ["class"]=> string(7) "Closure" } [4]=> object(ReflectionMethod)#9 (2) { ["name"]=> string(12) "fromCallable" ["class"]=> string(7) "Closure" } [5]=> object(ReflectionMethod)#11 (2) { ["name"]=> string(8) "__invoke" ["class"]=> string(7) "Closure" } } object(ReflectionMethod)#11 (2) { ["name"]=> string(4) "bind" ["class"]=> string(7) "Closure" } object(ReflectionMethod)#11 (2) { ["name"]=> string(6) "bindTo" ["class"]=> string(7) "Closure" }

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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