调用回调存储为成员变量

发布于 2024-11-28 22:07:08 字数 355 浏览 0 评论 0原文

php是否可以直接调用存储在类的成员变量中的回调？目前我正在使用一种解决方法，将回调暂时存储到本地变量中。

class CB {
  private $cb;
  public function __construct($cb) {
    $this->cb = $cb;
  }
  public function call() {
    $this->cb(); // does not work
    $cb = $this->cb;
    $cb(); // does work
  }
}

php 抱怨 $this->cb() 不是一个有效的方法，即不存在。

原文

Is it possible with php to directly call a callback stored in an member variable of a class? currently I'm using a workaround, where I'm temporarily storing my callback to a local var.

class CB {
  private $cb;
  public function __construct($cb) {
    $this->cb = $cb;
  }
  public function call() {
    $this->cb(); // does not work
    $cb = $this->cb;
    $cb(); // does work
  }
}

php complains that $this->cb() is not a valid method, i.e. does not exist.

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栖迟 2024-12-05 22:07:08

在php7中你可以这样调用它：

class CB {
  /** @var callable */
  private $cb;
  public function __construct(callable $cb) {
    $this->cb = $cb;
  }
  public function call() {
    ($this->cb)();
  }
}

In php7 you can call it like this:

class CB {
  /** @var callable */
  private $cb;
  public function __construct(callable $cb) {
    $this->cb = $cb;
  }
  public function call() {
    ($this->cb)();
  }
}

回复收藏 0 原文

森林迷了鹿 2024-12-05 22:07:08

您需要使用call_user_func：

class CB {
    private $cb;
    public function __construct($cb) {
        $this->cb = $cb;
    }
    public function call() {
        call_user_func($this->cb, 'hi');
    }
}

$cb = new CB(function($param) { echo $param; });
$cb->call(); // echoes 'hi'

You need to use call_user_func:

class CB {
    private $cb;
    public function __construct($cb) {
        $this->cb = $cb;
    }
    public function call() {
        call_user_func($this->cb, 'hi');
    }
}

$cb = new CB(function($param) { echo $param; });
$cb->call(); // echoes 'hi'

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