PHP中的異常處理

Question

我有這種情況：

Interface ClassInterface 
{
  public function getContext();
}

Class A implements ClassInterface 
{
  public function getContext()
  {
     return 'CONTEXTA';
  }

  //Called in controller class
  public function Amethod1() 
  {
    try {
       //assuming that Helper is a property of this class
        $this->helper->helperMethod($this);
     } catch(Exception $ex) {
       throw $ex;
     }
  }
}

Class B implements ClassInterface 
{
  public function getContext()
  {
     return 'CONTEXTB';
  }

  //Called in controller class
  public function Bmethod1() 
  {
     try {
       //assuming that Helper is a property of this class
        $this->helper->helperMethod($this);
     } catch(Exception $ex) {
       throw $ex;
     }
  }

}

Class Helper {
 public function helperMethod(ClassInterface $interface) 
 {
   try {
      $this->verifyContext($interface->getContext());
      //dosomething
   } catch(\Exception $ex) {
     throw $ex;
   }

 }

 private function verifyContext($context) {
    if (condition1) {
       throw new \UnexpectedValueException('Invalid context.');
    }

    return true;
 }

}

我希望我的調用Amethod1和Bmethod1的控制器類知道在該過程中引發的異常類型。 是否建議像提出異常一樣拋出異常？ 您認為在這種情況下， throw-catch-throw-catch-throw結構是否合理？

Answer 1

是的，完全合理。 但是：您的特定示例可以簡化為：

public function Amethod1() 
{
   try {
      //assuming that Helper is a property of this class
      $this->helper->helperMethod($this);
   } catch(Exception $ex) {
      throw $ex;
   }
}

至：

public function Amethod1() 
{

    //assuming that Helper is a property of this class
    $this->helper->helperMethod($this);
}