PHP：是否可以在引发异常时调用公共类函数？

Question

I am trying to get this litte demo to run, but I keep getting a plain string

"getConfiguration:Name (self::getName())is not supported"

(when using self::getName())

or an error-messege:

PHP Notice:  Undefined property: Demo::$getName

(when using $this->getName())

This is my Code:

    class Demo {
        protected $name = "demo";

        public function __construct() {
          try {
                if(true) {
                    throw new Exception("Name (self::getName())" .
                                        "is not supported");
                }
          } catch(Exception $e){
            echo $e->getMessage(); exit;
          }
        }

       public function getName() {
           return $this->demo;
       }
   }

Now is this simply not possible or am I doing something wrong here?!

EDIT:

Before this I got this working with $this->name , but I would rather use a function if it is possible and not somehow a very bad idea.

Answer 1

You are calling a function statically that is not static. Referencing to $this might also be problematic inside a construcotr, especially if it failed.

You should also change your Exception to not contain the call inside a string.

throw new Exception("Name (".self::getName().") is not supported");

Change your method to static access. You will also have to make your variable $demo static:

   protected static $name;

   public static function getName() {
       return self::$name;
   }

---

Throwing an exception just to get an echo doesnt make that much sense. You should either just echo your error and exit or throw an exception:

    public function __construct() {
        throw new Exception("Name (".self::getName().") is not supported");
    }

OR

    public function __construct() {
        echo "Name (".self::getName().") is not supported";
        exit;
    }