Online PHP editor | rfc for W8qch

@ 2014-09-20T14:48:25Z

<?php

class Dictionary
{

    private $kMap;

    private $vMap;

    private $kvHashMap;

    private $vkHashMap;

    public function add($k, $v)
    {
        $kHash = spl_object_hash($k);
        $vHash = spl_object_hash($v);
        $this->kMap[$kHash] = $k;
        $this->vMap[$vHash] = $v;
        $this->kvHashMap[$kHash] = $vHash;
        $this->vkHashMap[$vHash] = $kHash;
    }

    public function get($k)
    {
        $kHash = spl_object_hash($k);
        if (isset($this->kvHashMap[$kHash])) {
            $vHash = $this->kvHashMap[$kHash];
            if (isset($this->vMap[$vHash])) {
                return $this->vMap[$vHash];
            }
        }
        return null;
    }

    public function getKey($v)
    {
        $vHash = spl_object_hash($v);
        if (isset($this->vkHashMap[$vHash])) {
            $kHash = $this->vkHashMap[$vHash];
            if (isset($this->kMap[$kHash])) {
                return $this->kMap[$kHash];
            }
        }
        return null;
    }

}

$dictionary = new Dictionary();
$k = (object) ['i' => 'am a key'];
$v = (object) ['i' => 'am a value'];

$dictionary->add($k, $v);
var_dump($dictionary->get($k));
var_dump($dictionary->getKey($v));

Output for git.master, git.master_jit, rfc.property-hooks: object(stdClass)#3 (1) { ["i"]=> string(10) "am a value" } object(stdClass)#2 (1) { ["i"]=> string(8) "am a key" }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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