PHP类 - 样板或继承?

时间:2015-02-12 18:51:49

标签: php oop inheritance boilerplate

免责声明:我有点像菜鸟,只做了一年以下的PHP,并且做OO PHP不到那么。

我正在编写几个都具有相同功能的类。这是我的样板代码:

class ClassName {

   // required constructor arguments
   private $arg1;

   // optional arguments in an array. $options array specifies their names
   // and required types. '' means any type.
   private $options = array('option1'=>'type', 'option2'=>'');
   private $option1 = 'default_value';
   private $option2 = 'default_value';

   /* getters and setters would go here if I wanted them */

   // this would probably change after debugging
   public function __toString() {
      return print_r(get_object_vars($this), true); 
   }

   public function __construct($arg1, array $options = array()) {
      // set all required args
      $this->arg1 = $arg1;
      // cycle through $options array, check they are allowed,
      // and check their type
      foreach ($options as $option => $value) {
         $type = $this->options[$option]; // no value = any type is OK
         if (array_key_exists($option, $this->options) 
                && (gettype($value) === $type || !$type)) {
            $this->$option = $value;
         }
      }
   }

   // methods go here
}

我始终如一地使用这种格式:必需的参数,然后是数组中的可选参数,使用foreach循环分配所有可选变量,指定选项及其类型(我关心的主要区别是数组与非-array)作为私人变量。

检查和分配每个可选参数的foreach循环不会改变。我可以复制并粘贴它来创建新类,但我也认为做这样的事情可能会更好,以避免重复的代码:

abstract class ParentClass {

   public function __toString() {
      return print_r(get_object_vars($this), true); 
   }

   protected function setOptions($options) {
      foreach ($options as $option => $value) {
         $type = $this->options[$option]; // no value = any type is OK
         if (array_key_exists($option, $this->options) 
                 && (gettype($value) === $type || !$type)) {
            $this->$option = $value;
         }
      }
   }
}

class ChildClass extends ParentClass{

   private $arg1;
   private $arg2;
   private $options = array('option1'=>'string', 'option2'=>'array');
   private $option1 = 'default_value';
   private $option2 = array('foo', 'bar');

   public function __construct($arg1, $arg2, $options = array()) {
      $this->arg1 = $arg1;
      $this->arg2 = $arg2;

      parent::setOptions($options);

   }
}

我还没有完成继承。这是一个很好用的吗?

谢谢!

1 个答案:

答案 0 :(得分:2)

这将很好地利用继承,并且始终最佳做法是减少重复代码。当需求发生变化或出现错误时,DRY代码在将来修改时不那么麻烦。

编辑:顺便说一下,您还可以将所有构造逻辑放在父类的构造函数中,然后在子类中重写它,并在完成类特定逻辑时调用父构造函数。例如:

abstract class ParentClass {
   public function __construct($options) {
      foreach ($options as $option => $value) {
         $type = $this->options[$option]; // no value = any type is OK
         if (array_key_exists($option, $this->options) 
         && (gettype($value) === $type || !$type)) {
            $this->$option = $value;
         }
      }
   }
   public function __toString() {
      return print_r(get_object_vars($this), true); 
   }
}

class ChildClass extends ParentClass{
   private $arg1;
   private $arg2;
   private $options = array('option1'=>'string', 'option2'=>'array');
   private $option1 = 'default_value';
   private $option2 = array('foo', 'bar');

   public function __construct($arg1, $arg2, $options = array()) {
      $this->arg1 = $arg1;
      $this->arg2 = $arg2;

      parent::__construct($options);
   }
}