如何在Prestashop中全局访问变量

class mycustommodule extends Module
{
    public $myGlobalVariable;

    public function __construct()
    {
        $this->name = 'mycustommodule';
        $this->tab = 'others';
        $this->version = '1.0.0';
        $this->author = 'Your Name';
        $this->need_instance = 0;

        parent::__construct();

        $this->displayName = $this->l('My Custom Module');
        $this->description = $this->l('This is a custom module for global variable access.');

        $this->myGlobalVariable = 'Hello, World!';

        global $myGlobalVariable;
        $myGlobalVariable = $this->myGlobalVariable;
    }
}

class MyCustomModuleAdminController extends ModuleAdminController
{
    public function initContent()
    {
        global $myGlobalVariable;
        
        echo $myGlobalVariable; // 输出：Hello, World!
        
        parent::initContent();
    }
}