overload inheritance

test.php

<?php

error_reporting(E_ALL);

/**
* Father
*/
class Father
{
    
    protected $extended_values = [];
    
    function __construct()
    {
        $this->say("I'm your father");
    }
    
    public function &__get($name)
    {
        return $this->extended_values[$name];
    }
    
    public function __set($name, $value)
    {
        $this->say(sprintf("    Setting %s", $name));
        $this->extended_values[$name] = $value;
    }
    
    public function say($value)
    {
        printf("{$value} \n");
    }
    
    public function __destruct()
    {
        var_dump($this->extended_values);
    }
}

/**
* Kid
*/
class Kid extends Father
{
    function __construct()
    {
        parent::__construct();
        $this->say("Noooooooo");
    }
    
    public function init()
    {
        $vars = ['saber' => 'green', 'arm' => 'left'];

        foreach ($vars as $key => $value) {
            $this->dynamicVar[$key] = $value;
        }
        
        $this->dynamicVar['master'] = 'obi-wan';
    }
}

$test = new Kid();
$test->init();
$test->sister = 'Leila';