php幻術方法： _get() 和 _set()的妙用

php魔術方法： __get() 和 __set()的妙用

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_setters)) {      return $this->$property;    }    else if (method_exists($this, '_get_' . $property))      return call_user_func(array($this, '_get_' . $property));    else if (in_array($property, $this->_getters) OR method_exists($this, '_set_' . $property))      throw new Exception('Property "' . $property . '" is write-only.');    else      throw new Exception('Property "' . $property . '" is not accessible.');  }  public function __set($property, $value) {    if (in_array($property, $this->_getters)) {      $this->$property = $value;    }    else if (method_exists($this, '_set_' . $property))      call_user_func(array($this, '_set_' . $property), $value);    else if (in_array($property, $this->_setters) OR method_exists($this, '_get_' . $property))      throw new Exception('Property "' . $property . '" is read-only.');    else      throw new Exception('Property "' . $property . '" is not accessible.');  }}?>This way the variables in the $_getters array can be read from the outside and the variables in the $_setters array can be modified from the outside, like this:title = 'Hello, World';echo $post->title;// The following will throw an exception since $comments is read-only:$post->comments = 23;?>And in case you need a less generic getter or setter at some point, you can remove the variable from the $_getters or $_setters array and implement a method like:title = str_replace('World', 'Universe', $value);}?>And from the outside the property could still be used with:title = 'Hello, World!';?>

?上面是手冊裡的例子，但是我覺得應該是先判斷類裡面是否有處理屬性的方法，有的話就調用該方法，沒有就直接設定該屬性。

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