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@ 2016-05-07T23:47:49Z

<?php

class Reference {
    
    private static $DATA = [];
    private $index = 0;
    
    public function __construct($value) {
        // cannot create a reference of a reference
        if ($value instanceof self) {
            $this->index = $value->index;
        } else {
            $this->index = count(self::$DATA);
            self::$DATA[$this->index] = $value;
        }
    }
    
    public function get() {
        return self::$DATA[$this->index];
    }
    
    public function set($value) {
        self::$DATA[$this->index] = $value;
    }

}

$orig = [1];

// $ref =& $orig[0];
$orig[0] = new Reference($orig[0]);
$ref = clone $orig[0];

$copy = $orig;
$copy[0] = clone $orig[0]; // creating a copy of what was in $orig[0]

// $orig[0] = 10;
$orig[0]->set(10);

// var_dump($copy[0]);
var_dump($copy[0]->get());

Output for git.master, git.master_jit, rfc.property-hooks: int(10)

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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