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@ 2015-04-15T22:53:53Z

<?php

final class CanNotSetProperties extends BadMethodCallException
{
    public function __construct($message)
    {
        parent::__construct($message);
    }
    
    public function exception($message)
    {
        return new static($message);
    }
}

final class ConstructorIsVisible extends BadMethodCallException
{
    public function __construct($message)
    {
        parent::__construct($message);
    }
    
    public function exception($message)
    {
        return new static($message);
    }
}

trait Immutable
{
    public function __set($property, $value)
    {
        throw CanNotSetProperties::exception();
    }
    
    protected function __construct()
    {
        throw ConstructorIsVisible::exception();
    }
}

final class Test {
    use Immutable;
    
    public function __construct()
    {
        echo 'hello';
    }
}

$test = new Test;
$test->__construct();

Output for git.master, git.master_jit, rfc.property-hooks: hellohello

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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