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@ 2018-10-24T21:11:40Z

<?php

class MyEnum {
    
    private $values = [
        'A' => 1,
        'B' => 2,
        'C' => 3,
    ];

    private $key = null;

    public function __construct($key) {
        if (!isset($this->values[$key])) {
            throw new Exception('Incorrect Enum Value');
        }
        
        $this->key = $key;
    }

    public function key(): string {
        return $this->key;
    }

    public function val(): int {
        return $this->values[$this->key];
    }
}

function foo(MyEnum $foo) {
    echo $foo->val().PHP_EOL;
}

// This works
foo(new MyEnum('A'));

try {
    // Rejected, don't allow passing the underlying value
    foo(1);    
} catch (\Throwable $e) {
    echo $e->getMessage().PHP_EOL;
}

try {
    // Rejected, value not part of the enum
    foo(new MyEnum('D'));    
} catch (\Throwable $e) {
    echo $e->getMessage().PHP_EOL;
}

Output for git.master, git.master_jit, rfc.property-hooks: 1 foo(): Argument #1 ($foo) must be of type MyEnum, int given, called in /in/bBpRu on line 39 Incorrect Enum Value

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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