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@ 2015-02-10T09:50:40Z

<?php

class Invariant{
    private $value;
    private $check;
    private $description;
    function __construct($check, $description){
        $this->check = $check;
        $this->description = $description;
    }
    
    function set($value){
        $check = $this->check;
        if($check($value)){
            $this->value = $value; 
        }else{
            trigger_error("Invariant ".$this->description." violated.", E_USER_ERROR);
        }
    }
    function get(){
        return $this->value;
    }
}

class A{
    protected $a;
    function __construct(){
        $this->a = new Invariant(function($value){return $value > 100;}, '$this->a > 100');
    }
}
class B extends A{
     function __construct(){
        parent::__construct();
        $this->a->set(10);  //error
        $this->a->set(101); //that's ok
    }
}
$b = new B();

Output for git.master, git.master_jit, rfc.property-hooks: Fatal error: Invariant $this->a > 100 violated. in /in/vjBRG on line 17
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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