PHP建構函式的執行順序

PHP建構函式的執行順序

測試代碼如下：

<?phpclass grandfather {    public function __construct(){        echo 'grandfather';    }}class father extends grandfather {    public function __construct(){        echo 'father';    }}class son extends father {    public function __construct(){        echo 'son';    }}$test = new son();

結果是 :   son

<?phpclass grandfather {    public function __construct(){        echo 'grandfather';    }}class father extends grandfather {    public function __construct(){        echo 'father';    }}class son extends father {    }$test = new son();

結果： father

<?phpclass grandfather {    public function __construct(){        echo 'grandfather';    }}class father extends grandfather {}class son extends father {    }$test = new son();

結果：grandfather由此可見php類的建構函式調用是 從自身向上尋找，執行最近的一個，然後stop