Online PHP editor | rfc for sK0Qm

@ 2016-01-13T05:47:29Z

<?php

trait Immutable {
    private static $sealed = array();
    
    public function __set($name, $value) {
        if (isset(self::$sealed[spl_object_hash($this)])) {
            throw new Exception("can't touch this, nah nah nuh nahhh");
        }
        $this->$name = $value;
    }
    
    public function __get($name) {
        return $this->$name;
    }
    
    protected function finalize() {
        self::$sealed[spl_object_hash($this)] = true;
        // You could probably implement a __destruct to clean up and avoid leaking memory here,
        // but who gaf anyway this is just an example
        // You could also just define a private $sealed property on the trait instead of storing this
        // statically, but then the object instances would have this tacked-on $sealed property, which
        // isn't great either.
        // Again, just an example.
    }
}

class ImmutableThingy {
    use Immutable;
    
    protected $foo;
    
    public function __construct($foo)
    {
        $this->foo = $foo;
        $this->finalize();
    }
}

$thing = new ImmutableThingy("bar");

var_dump($thing, $thing->foo);

$thing->foo = 'baz';

var_dump($thing, $thing->foo);

Output for git.master, git.master_jit, rfc.property-hooks: object(ImmutableThingy)#1 (1) { ["foo":protected]=> string(3) "bar" } string(3) "bar" Fatal error: Uncaught Exception: can't touch this, nah nah nuh nahhh in /in/sK0Qm:8 Stack trace: #0 /in/sK0Qm(44): ImmutableThingy->__set('foo', 'baz') #1 {main} thrown in /in/sK0Qm on line 8
Process exited with code 255.

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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