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@ 2020-09-20T15:18:28Z

<?php

final
class Mapper
{
    private $from;

    public
    function __construct($from)
    {
        $this->from = $from;
    }

    public
    function __invoke($key)
    {
        if (is_object($key))
            foreach ($this->from as $k => $v)
                if ($v === $key)
                    return $k;
        return $this->from[$key];
    }
}

/*
enum Suit { H, C, D, S }
*/
abstract class Suit { }
$H = new class extends Suit { };
$C = new class extends Suit { };
$D = new class extends Suit { };
$S = new class extends Suit { };

$dbMapper = new Mapper([ 1 => $H, 2 => $C, 3 => $D, 4 => $S ]);
$jsonMapper = new Mapper([ 'h' => $H, 'c' => $C, 'd' => $D, 's' => $S ]);

var_dump($dbMapper(1));
var_dump($dbMapper($H));

var_dump($jsonMapper('c'));
var_dump($jsonMapper($C));

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7: object(Suit@anonymous)#1 (0) { } int(1) object(Suit@anonymous)#2 (0) { } string(1) "c"
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 object(Suit@anonymous)#1 (0) { } int(1) object(Suit@anonymous)#2 (0) { } string(1) "c"
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: object(class@anonymous)#1 (0) { } int(1) object(class@anonymous)#2 (0) { } string(1) "c"

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