如何动态访问另一个类的静态属性和静态常量

debugcn 发表于 Dev

ssp辛格

这是我的PHP示例代码，我想动态访问另一个类的静态属性，基本上我有一个存储在变量中的类名。

# Main Class
class HelloAction
{
    const FIRST = "DEMO";
    public static $first = "WORLD";
    function __construct($confclassname)
    {
        $this->config = $confclassname;
        # PHP Interpreter throws an Error for These Two Lines
        $this->first1 = $this->config::$a;
        $this->first2 = $this->config::$b;
    }

    function setFirst($s)
    {
        self::$first = $s;
    }
}

# Configuration Class
# Can hold only static or constants values
class action1
{
    const AAAA = "____Hello World____";
    public static $a = "this is an apple";
    public static $b = "That is an Dog";
    function __construct()
    {
        $this->second = "hi, there.";
    }
}

# Configuration Class
# Can hold only static or constants values
class action2
{
    const AAAA = "___Yeah, Hello World____";
    public static $a = "Whare You were...";
    public static $b = "Awesome work";
    function __construct()
    {

    }
    public static function action21($s)
    {
        self::$a = $s;
    }
    public function action22()
    {
        return self::$a;
    }
}

# We want to inject configuration Object into Main Class Object
$b1 = new HelloAction('action1');
$b2 = new HelloAction('action2');

echo $b1->first1 . "\n";
echo $b1->first2 . "\n";

错误：解析错误：语法错误，第11行的F：\ xampp \ htdocs \ 6-project-n_demos \ 011.php中出现意外的'::'（T_PAAMAYIM_NEKUDOTAYIM）

mega6382

注释行11，12然后尝试执行操作var_dump this->config，您将看到它不是在选择整个对象，而是__construct因为您是在对象上调用静态方法，因此请尝试以下代码

        class HelloAction
        {
            const FIRST = "DEMO";
            public static $first = "WORLD";
            function __construct($confclassname)
            {
                $this->config = $confclassname;
                # PHP Interpreter throws an Error for These Two Lines
                $this->first1 = $confclassname::$a;
                $this->first2 = $confclassname::$b;
            }

            function setFirst($s)
            {
                self::$first = $s;
            }
        }

        class action1
        {
            const AAAA = "____Hello World____";
            public static $a = "this is an apple";
            public static $b = "That is an Dog";
            function __construct()
            {
                $this->second = "hi, there.";
            }
        }

        class action2
        {
            const AAAA = "___Yeah, Hello World____";
            public static $a = "Whare You were...";
            public static $b = "Awesome work";
            function __construct()
            {

            }
            public static function action21($s)
            {
                self::$a = $s;
            }
            public function action22()
            {
                return self::$a;
            }
        }

        $b1 = new HelloAction('action1');
        $b2 = new HelloAction('action2');

        echo $b1->first1 . "\n";
        echo $b1->first2 . "\n";

        ?>

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