爲什麼不是新的運算符創建鏈結構？

Question

假設GeneralNews()返回this和CreateInstance()返回this，前2個方法工作，但最後一個失敗。

我不明白爲什麼？

$objGeneralNews = new GeneralNews(); 

$arrDataList = $objGeneralNews->SetWhere('news01date="2011-01-01"')->GetFrontList(); 
var_dump($arrDataList); //This method works 

$arrDataList = GeneralNews::CreateInstance()->SetWhere('news01date="2011-01-01"')->GetFrontList(); 
var_dump($arrDataList); //This method works 

$arrDataList = (new GeneralNews())->SetWhere('news01date="2011-01-01"')->GetFrontList(); 
var_dump($arrDataList); //This method doesn't works 

類代碼GeneralNews：

class GeneralNews {   
    public function GeneralNews(){ 
     return this; 
    } 

    public static function CreateInstance(){ 
     $strClassName = 'GeneralNews'; 
     return new $strClassName; 
    } 
} 

Answer 1

事實上，直接引用的new表達does not work in PHP 5.3，但does work in PHP 5.4對象。