PHP - 禁用仅在开发中需要的 类

Question

我正在PHP写一个小脚本，正在用开发区的Profiler看哪个functions/actions慢等

$this->profiler = new \Fabfuel\Prophiler\Profiler();

然后我在各个地方以不同的方法使用它（通过 DI 传递它，使用 League\Container\Container class）：

$profilerSeg = $profiler->profilerStartSegment('Page Load','CMS');
...
$profiler->profilerStopSegment($profilerSeg);

问题是，我只想在开发中使用它。考虑一个 IF 语句：

if($this->environment === 'DEV')
    $profilerSeg = $profiler->profilerStartSegment('Page Load','CMS');
...
if($this->environment === 'DEV')
    $profiler->profilerStopSegment($profilerSeg);

但是到处都有它看起来很难看。然后我考虑制作一个 "fake profiler" 如果脚本正在生产中，它会被传递，所以所有调用都会 return NULL。

处理这种情况的最佳方法是什么：class 仅在开发中需要但不应在生产中加载？

Answer 1

典型的 oop 使用继承

大多数方法定义了一个根 class，所有（或大多数）其他 classes 扩展

Class main {
    private $profiler;

    public __construct(){
        $this->profiler = new \Fabfuel\Prophiler\Profiler();
        // you can comment and uncomment the above line.
    }

    public profStart(){
        if (!empty($this->profiler)) {
            $this->profiler->profilerStartSegment($a,$b);
        }
    }
}

Class someThing Extends main {
     // $profiler is already set as part of the constructor
     $this->profStart('someThing','strange');
}

Class otherThing Extends someThing {
     // but if you want a constructor, you have to daisy-chain the class constructors
     public __construct() {
          parent::__construct();
     }
}

或者，换出一个空对象

...但这通常被认为是不好的做法

Class deadendObject {
     public __get($var){}
     public __set($var,$val){}
     public __call($var,$args){}
     // see: http://php.net/manual/en/language.oop5.magic.php
}

if ($profileMe) {
     $this->profiler = new \Fabfuel\Prophiler\Profiler();
} else {
     $this->profiler = new deadendObject();
}

设置是否在 Profiler 对象本身中执行操作

Class Profiler {
    public $enabled = true;

    public function doSomething(){
         if($this->enabled) {
              // do stuff
         }
    }
}

$profiler = new \Fabfuel\Prophiler\Profiler();
$profiler->enabled = false;

最好是继承和让探查器处理行为变化的组合。

Class Profiler {
    public $enabled = true;

    public function doSomething($var = "unknown"){
         if($this->enabled) {
              // do stuff
         }
    }
}

Class main {
    public $profiler;

    public __construct(){
        $this->profiler = new Profiler();
        $this->profiler->enabled = true;
        // better still would be to define this behavior according to a settings file, or environment variables with getenv()
    }
}

Class someThing Extends main {
     // $profiler is already set as part of the constructor
     $this->profiler->doSomething('neighborhood');
}

我不怕鬼！