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@ 2013-09-27T09:46:50Z

<?php

class prototype
{
    private $inherited;

    private $instance;

    public function __construct(prototype $prototype = null)
    {
        $this->inherited = $prototype;
        $this->instance = [];
    }

    public function __set($name, $value)
    {
        if ($value instanceof \Closure) {
            $value = $value->bindTo($this);
        }

        $this->instance[$name] = $value;
    }

    public function __get($name)
    {
        if (array_key_exists($name, $this->instance)) {
            return $this->instance[$name];
        } else {
            return $this->inherited->$name;
        }
    }

    public function __call($name, $arguments)
    {
        if (!isset($this->instance[$name])) {
            if (!isset($this->inherited) || !($fromPrototype = $this->inherited->$name) instanceof \Closure) {
                return; // or better, blow up
            }

            $this->instance[$name] = $fromPrototype->bindTo($this);
        }

        if (!($this->instance[$name] instanceof \Closure)) {
            return; // or better, blow up
        }

        return call_user_func_array($this->instance[$name], $arguments);
    }
}

$foo = new prototype;
$foo->foo = 'Foo!';
$foo->bar = function() {
    return $this->foo;
};

$bar = new prototype($foo);
$bar->foo = 'Bar!';

echo $foo->foo . "\n";
echo $bar->foo . "\n";

Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.29 - 7.2.33, 7.3.12 - 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: Foo! Bar!
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/jVl04 on line 12
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected '[' in /in/jVl04 on line 12
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/jVl04 on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/jVl04 on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/jVl04 on line 5
Process exited with code 255.

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