pattern edit class inside class

index.php

<?php

class First
{
	private $second;

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

	public function edit(callable $fun)
	{
		$fun($this->second);
		return $this;
	}

	public function show()
	{
		echo $this->second->getValue();
	}
}

class Second
{
	private $value;

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

	public function edit($value)
	{
		$this->value = $value;
		return $this;
	}

	public function getValue()
	{
		return $this->value;
	}
}

$second = new Second(123);
$first = new First($second);

echo $second->getValue() . "\n";

echo $first->edit(function ($second) {
	$second->edit(567);
})->show() . "\n";