doufangmu9087
doufangmu9087
2015-01-24 23:25
浏览 84
已采纳

如何从PHP中的公共静态方法访问私有类的属性

I have a class (yii2 widget) that has private properties and public static functions. When I try to access a private property from the static method like $this->MyPrivateVar an error is generated regarding that I don't have to use $this in non object context! The following is a snippet of my code:

class JuiThemeSelectWidget extends Widget
{
  private $list;
  private $script;
  private $juiThemeSelectId = 'AASDD5';
  public $label;
  ....
 public static function createSelectList($items)
  {
    $t = $this->juiThemeSelectId;
    ...
  }

I tried the following, but it seems that undergoes to infinite loop Maximum execution time of 50 seconds exceeded!

public static function createSelectList($items)
  {
    $t = new JuiThemeSelectWidget;
    $juiThemeSelectId = $t->juiThemeSelectId;
    ...
  }

So how could I access the private juiThemeSelectId from the static method?

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2条回答 默认 最新

  • dongshang5862
    dongshang5862 2015-01-24 23:41
    已采纳

    The sort answer is: You can't access a non-static property in a static method. You don't have access to $this in a static method.

    What you could do is just to change the property to static like:

    private static $juiThemeSelectId = 'AASDD5';
    

    And then access it with this:

    echo self::$juiThemeSelectId;
    

    For more information about the keyword static see the manual: http://php.net/manual/en/language.oop5.static.php

    And a quote from there:

    Because static methods are callable without an instance of the object created, the pseudo-variable $this is not available inside the method declared as static.

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  • dsxcv5652
    dsxcv5652 2015-01-24 23:32

    you can access it using self:

    public static function createSelectList($items)
    {
      $t = self::juiThemeSelectId;
      ...
    }
    
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