在 PHP 8.5 之前，如果要在闭包内部实现递归调用（即闭包调用自身），需要将「变量引用」绑定到闭包中的变通方法，下面是一个计算斐波那契数列的例子：
$fibonacci = function (int $n) use (&$fibonacci) {if ($n === 0) return 0;if ($n === 1) return 1;return $fibonacci($n-1) + $fibonacci($n-2);};echo $fibonacci(10). "n";
PHP 8.5 引入了 Closure::getCurrent() 方法，这个方法可以可以为闭包提供了自引用能力，允许闭包在执行过程中获取对自身的引用，从而使得递归调用变得非常简单和清晰，上面计算斐波那契数列的代码可以改成：
$fibonacci = function (int $n) {if (0 === $n || 1 === $n) {return $n;}$fn = Closure::getCurrent();return $fn($n - 1) + $fn($n - 2);};echo $fibonacci(10) . "n";
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