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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