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<?php

class Foo
{
    public $bar;

    public function setBar($bar)
    {
        $this->bar = $bar;
    }

    public function getBar()
    {
        return $this->bar;
    }
}

class Bar
{
}

$bar = new Bar();
$foo = new Foo();
$foo->setBar($bar);

unset($bar);

var_dump($foo->getBar());