Object Test

ObjectTest.php

class Ha {
    function __construct() {
        // 1. Look there
        $action = new Action();
        $action->setMsg("你好世界");
        $this->handleActionObj($action, "Hello World");
        echo $action->getMsg();
    }
    
    function handleActionObj(Action $actionObj, $msg) {
        $actionObj->setMsg($msg);
    }
}

class Action {
    private $msg = "";
    
    public function setMsg($msg) {
        $this->msg = $msg;
    }
    
    public function getMsg() {
        return $this->msg;
    }
}

// 1
new Ha();

echo "<br/>";

// 2
(function () {
    // 2. Look there
    $a = "你好世界";
    $b = $a;
    $b = "Hello World";
    echo $a;
})();

// 执行结果:
// Hello World
// 你好世界