返回闭包内与 $this 对应的对象

# ReflectionFunctionAbstract::getClosureThis

(PHP 5 >= 5.4.0, PHP 7, PHP 8)

ReflectionFunctionAbstract::getClosureThis — 返回闭包内与 $this 对应的对象

### 说明

public function ReflectionFunctionAbstract::getClosureThis(): ?object

如果函数是非静态闭包，获取绑定到闭包内部 $this 的对象。

### 参数

此函数没有参数。

### 返回值

返回 Closure 中 $this 所表示的对象实例。如果函数不是闭包或者没有 $this，则返回 `null`。

### 示例

示例 #1 Example showcasing difference between ReflectionFunctionAbstract::getClosureCalledClass(), ReflectionFunctionAbstract::getClosureScopeClass(), and ReflectionFunctionAbstract::getClosureThis() with a closure in the object context

    <?php

    class A
    {
        public function getClosure()
        {
            var_dump(self::class, static::class);

            return function() {};
        }
    }

    class B extends A {}

    $b = new B();
    $c = $b->getClosure();
    $r = new ReflectionFunction($c);

    var_dump($r->getClosureThis()); // $this === $b, since a non-static closure take the object context
    var_dump($r->getClosureScopeClass()); // Corresponds to the self::class resolution inside a closure
    var_dump($r->getClosureCalledClass()); // Corresponds to the static::class resolution inside a closure

    ?>

以上示例会输出：

    string(1) "A"
    string(1) "B"
    object(B)#1 (0) {
    }
    object(ReflectionClass)#4 (1) {
      ["name"]=>
      string(1) "A"
    }
    object(ReflectionClass)#4 (1) {
      ["name"]=>
      string(1) "B"
    }

示例 #2 Example showcasing difference between ReflectionFunctionAbstract::getClosureCalledClass(), ReflectionFunctionAbstract::getClosureScopeClass(), and ReflectionFunctionAbstract::getClosureThis() with a static closure without an object context

    <?php

    class A
    {
        public function getClosure()
        {
            var_dump(self::class, static::class);

            return static function() {};
        }
    }

    class B extends A {}

    $b = new B();
    $c = $b->getClosure();
    $r = new ReflectionFunction($c);

    var_dump($r->getClosureThis()); // NULL, since the pseudo-variable $this is not available in a static context
    var_dump($r->getClosureScopeClass()); // Corresponds to the self::class resolution inside a closure
    var_dump($r->getClosureCalledClass()); // Corresponds to the static::class resolution inside a closure

    ?>

以上示例会输出：

    string(1) "A"
    string(1) "B"
    NULL
    object(ReflectionClass)#4 (1) {
      ["name"]=>
      string(1) "A"
    }
    object(ReflectionClass)#4 (1) {
      ["name"]=>
      string(1) "B"
    }

### 参见

- ReflectionFunctionAbstract::getClosureCalledClass() - Returns the class corresponding to static:: inside a closure
- ReflectionFunctionAbstract::getClosureScopeClass() - Returns the class corresponding to the scope inside a closure
- 后期静态绑定

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