closure_test.php

<?php

class TestClosure {

	public $hoge = 'hoge';
	public $piyo = 'piyo';
	public $fuga = 'fuga';

	public function delegate($lambda) {
		return $lambda($this);
	}

	public function piyo() {
		return $this->delegate(function($this) {
			return $this->piyo;
		});
	}

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

}

class TestObject {

	public $test;

	public function __construct() {
		$this->test = new TestClosure;
	}

	public function callHoge() {
		return $this->test->delegate(function ($this) {
			return call_user_func(array($this, 'hoge'));
		});
	}

}

$obj = new TestObject;
echo $obj->callHoge();

$test = new TestClosure;

echo $test->delegate(function($this) {
	return $this->hoge;
});

echo "\n";

echo $test->piyo();