从函数中调用PHP对象方法

发布时间：2020-12-13 16:46:07 所属栏目：PHP教程来源：网络整理

导读：我有保护功能,它创建一个类对象 protected function x() { $obj = new classx();} 现在我需要从不同的函数访问类对象的方法(我不想再次初始化). protected function y() { $objmethod = $obj-methodx();} 我怎么能完成它？哦,这两个函数都存在于同一个类中,

我有保护功能,它创建一个类对象

protected function x() {
    $obj = new classx();
}

现在我需要从不同的函数访问类对象的方法(我不想再次初始化).

protected function y() {
    $objmethod = $obj->methodx();
}

我怎么能完成它？

哦,这两个函数都存在于同一个类中,说’class z {}’

错误消息是

Fatal error: Call to a member function get_verification() on a non-object in

解决方法

将$obj(classx的实例)存储在ClassZ的属性中,可能作为私有属性.在ClassZ构造函数或其他初始化方法中初始化它,并通过$this-> obj访问它.

class ClassZ {
  // Private property will hold the object
  private $obj;

    // Build the classx instance in the constructor
  public function __construct() {
    $this->obj = new ClassX();
  }

  // Access via $this->obj in other methods
  // Assumes already instantiated in the constructor
  protected function y() {
    $objmethod = $this->obj->methodx();
  }

  // If you don't want it instantiated in the constructor....

  // You can instantiate it in a different method than the constructor
  // if you otherwise ensure that that method is called before the one that uses it:
  protected function x() {
    // Instantiate
    $this->obj = new ClassX();
  }

  // So if you instantiated it in $this->x(),other methods should check if it
  // has been instantiated
  protected function yy() {
    if (!$this->obj instanceof classx) {
      // Call $this->x() to build $this->obj if not already done...
      $this->x();
    }
    $objmethod = $this->obj->methodx();
  }
}

（编辑：李大同）

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