Php 许多调用方法-注意

我尝试设置许多相同的方法。该参数取决于数组元素。如果案例：1-显示“1”号，如果案例：2-显示“2”号。我提供代码：

<?php
    error_reporting(E_ALL); 
    ini_set('display_errors', 1);

    class Test {
        protected $target = array('1' ,'2');
        private $message;

        public function setTarget($target) {
            return $this->target = $target;
        }

        public function getTarget() {
            return $this;
        }   
        public function getMessage() {
            return $this->message;
        }
        public function set($target) {
            switch($target) {
                case '1':
                    $this->message = $this->setTarget($this->target[0]);
                break;
                case '2':
                    $this->message = $this->setTarget($this->target[1]);
                break;
            } 
            return 
                $this->message; $this->target;
        }

    }
    $foo = new Test;

    echo $foo->set(1);
    echo $foo->set(2);
    echo $foo->set(1);
    echo $foo->set(1);
    echo $foo->set(2);
    echo $foo->set(1);

---

在第一次
set
方法调用中，
setTarget
将目标列表的值更改为
$this->target[0]

将目标列表与当前目标分开。在下面的示例中，我将
$message
转换为当前目标，可用目标列表位于
$targets

<?php
error_reporting(E_ALL); 
ini_set('display_errors', 1);

class Test {
    protected $targets = array('1' ,'2');

    private $currentTarget;

    public function setTarget($target) {
        // set the current target, do not override $this->targets
        return $this->currentTarget = $target;
    }

    public function getTarget() {
        // why are you returning $this here
        // imo, should be $this->currentTarget;
        return $this;
    }   
    public function getMessage() {
        return $this->message;
    }
    public function set($target) {
        switch($target) {
            case '1':
                $this->currentTarget = $this->setTarget($this->targets[0]);
            break;
            case '2':
                $this->currentTarget = $this->setTarget($this->targets[1]);
            break;
        } 
        return 
            $this->currentTarget;
    }

}
$foo = new Test;

echo $foo->set(1);
echo $foo->set(2);
echo $foo->set(1);
echo $foo->set(1);
echo $foo->set(2);
echo $foo->set(1);

只要调用
setTarget
，您就会用字符串覆盖
$target
数组。另外，
setTarget
不会返回任何内容，因此当您第一次回显$foo->set（1）时，它不会为
$this->message
分配任何值；受保护的目标值是目标[0]，而不是您的ini阵列您有什么建议？如何修理？