Как передать переменную в класс php?

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<?php

class TestClass
{
    /**
     * @var mixed
     */
    private $params;

    public function __construct($params)
    {
        $this->params = $params;
    }

    /**
     * @return mixed
     */
    public function getParams()
    {
        return $this->params;
    }

    /**
     * @param mixed $params
     */
    public function setParams($params)
    {
        $this->params = $params;
    }
}

$test = new TestClass('Я Строка');

// Я строка
echo $test->getParams();

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class MyClass {
  public function __construct($param) {
    $this->param = $param;
  }
}

$obj = new MyClass('Hello');
echo $obj->param; // Outputs 'Hello'

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class MyClass {
  private $param;
  public function setParam($param) {
    $this->param = $param;
  }
}

$obj = new MyClass();
$obj->setParam('Hello');

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class MyClass {
  public static $param;
}

MyClass::$param = 'Hello';
echo MyClass::$param; // Outputs 'Hello'

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class MyClass {
  public function getParam() {
    global $param;
    return $param;
  }
}

$param = 'Hello';
$obj = new MyClass();
echo $obj->getParam(); // Outputs 'Hello'