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PHPのクロージャで $this を使う方法

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$this はそのまま use で渡せないので、 $that = $this; みたいなことをする。どっかのスクリプト言語で見たような・・・。

<?php

class Foo
{
	public function getClosure()
	{
		$that = $this;
	
		$closure = function() use ($that) {
			$that->bar();
		};
		
		return $closure;
	}
	
	public function bar()
	{
		echo 'Called bar method.', PHP_EOL;
	}
}

$foo = new Foo();
$closure = $foo->getClosure();
$closure(); // Called bar method.
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