尝试访问php中包含对象的属性 [英] Trying to access properties of the containing object in php

问题描述

经过几个小时寻找解决方案和模式，现在是时候问问专业人士了。

我想在逻辑层次结构中订购我的对象，想要能够访问父对象的属性。一个简单的例子，我喜欢它的工作...

  class car {
 
 public $ strType; //保存字符串
 public $ engine; //保存另一个类的实例
 
 public function __construct（）{
 $ this-> type =Saab; 
 //尝试传递$ this以使其在$ this-> engine中可访问
 $ this-> engine = new engine（$ this）; 
} 
 
} 
 
 class engine {
 
 public $ car; 
 
 public function __construct（$ parent）{
 $ this-> car = $ parent; 
} 
 
 public function start（）{
 //这里是我想要访问汽车属性和方法... 
 echo $ this > car-> $ strType; 
} 
} 
 
 $ myCar = new car（）; 
 $ myCar-> engine-> start（）; 
  

我不会实现的是引擎中的方法可以访问父汽车属性。
我设法这样做，但我相信这是非常丑陋...

  $ myCar =新汽车（）; 
 $ myCar-> addParent（$ myCar）; 
  

在addParent中，MethodI可以将实例传递给引擎对象。
但是这不能是线索，可以吗？是我的整个想法奇怪吗？

我不想让引擎从汽车继承，因为一个汽车有很多方法和属性和引擎没有。

解决方案

正如@Wrikken所提到的，正确的语法是 echo $ this-> car-> strType;

类似似乎不是 car 的成员，但如果您更改到

  $ this-> strType =Saab 
  

然后，所讨论的语句现在应该回应Saab

虽然我认为这里的好习惯是没有引擎类包含一个汽车对象，只是汽车类应该包含一个引擎对象。而且属性会更好，因为 private 。所以你可以有一个汽车方法像

  public startEngine（）{
 $ success = $ this-> engine - > start（）; 
 if（success）{
 echoEngine started successfully！; 
} else {
 echoEngine is busted！; 
} 
} 
  

其中 engine :: start （）返回一个布尔值。

After hours looking for solutions and patterns, it's time for me to ask the pros.

I'd love to order my object in a logical hierarchy, but still want to be able to access properties of the parent object. A simple example how I'd love to have it work...

    class car {

       public $strType;  // holds a string
       public $engine;   // holds the instance of another class

       public function __construct(){
           $this->type = "Saab";
           // Trying to pass on $this to make it accessible in $this->engine
           $this->engine = new engine($this);
       }

    }

    class engine {

        public $car;

        public function __construct($parent){
            $this->car = $parent;
        } 

        public function start(){
            // Here is where I'd love to have access to car properties and methods...
            echo $this->car->$strType;
        }
    }

    $myCar = new car();
    $myCar->engine->start();

What I won't achieve is that a method in engine can access the 'parent' car properties. I managed to do so like this, but I believe that is very very ugly...

    $myCar = new car();
    $myCar->addParent($myCar);

From within the addParent MethodI would be able to pass the instance on to the engine object. But that can't be the clue, can it? Is my whole idea queer?

I don't want engine to inherit from car because a car has lots of methods and properties and engine has not. Hope you get what I mean.

Hoping for hints, Cheers Boris

解决方案

As @Wrikken mentioned, the correct syntax would be echo $this->car->strType;

type does not seem to be a member of car, but if you changed it the line to

$this->strType = "Saab";

Then the statement in question should now echo "Saab"

Though I think good practice here would be to not have the engine class contain a car object, just the car class should contain an engine object. And the properties would be better off as private. So you could have a car method like

public startEngine() {
    $success = $this->engine->start();
    if(success) {
        echo "Engine started successfully!";
    } else {
        echo "Engine is busted!";
    }
}

Where engine::start() returns a boolean.

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