将请求重定向到另一个类

Question

I have three classes. Class A, Class B, Class C. What I am trying to do, send a request to Class B form Class A, and Class B must redirect that request to Class c.

May be a simple example from below will give a certain idea.

class classa {
    public function __construct() {
        $obj_classb = new classb;
        $obj_classb -> someRequest(); // This request must go to Class B and query the Class C        
    }
}

class classb {
    //This class must do something, which is going to redirect any sorts of request it receives to the next classc
}

class classc {
    public function someRequest() {
        //do whatever
    }
}

Any Idea?

Answer 1

You can create a "redirector" class by overriding the __call method like this:

class classb {
    private $obj_classc;

    public function __construct() {
        $this->obj_classc = new classc;
    }

    public function __call($name, $arguments) {
        return call_user_func_array(array($this->obj_classc, $name), $arguments);
    }
}

Of course this will "forward" only method calls; if you are interested in forwarding property getters/setters etc you will have to override more magic methods.

Choosing the forwarding target can also be arranged (in this example it's just an automatically-created classc object; but you can pass it as a parameter in the constructor or provide it in any other way you choose).

Update: Magic functions you need to override to forward property accesses:

public function __set($name, $value) {
    $this->obj_classc->$name = $value;
}

public function __get($name) {
    return $this->obj_classc->$name;
}

public function __isset($name) {
    return isset($this->obj_classc->$name);
}

public function __unset($name) {
    unset($this->obj_classc->$name);
}