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@ 2016-01-13T05:53:00Z

<?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
    }
}

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 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: 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/8UkOZ:8 Stack trace: #0 /in/8UkOZ(40): ImmutableThingy->__set('foo', 'baz') #1 {main} thrown in /in/8UkOZ on line 8
Process exited with code 255.
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38: object(ImmutableThingy)#1 (1) { ["foo":protected]=> string(3) "bar" } string(3) "bar" Fatal error: Uncaught exception 'Exception' with message 'can't touch this, nah nah nuh nahhh' in /in/8UkOZ:8 Stack trace: #0 /in/8UkOZ(40): ImmutableThingy->__set('foo', 'baz') #1 {main} thrown in /in/8UkOZ on line 8
Process exited with code 255.

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