A callable as class property

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<?php
class Processor
{
    private $postHook;

    public function __construct(callable $postHook)
    {
        $this->postHook = $postHook;
    }

    public function process()
    {
        // some statements here
        ($this->postHook)($param1, $param2, $param3);
    }
}

class Client
{
    public function main()
    {
        $processor = new Processor($this->postProcess());
        $processor->process();
    }

    private function postProcess()
    {
        return function ($arg1, $arg2, $arg3) {
            // some statements
        };
    }
}

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