在面向对象的设计中，使用WordPress核心类的最佳方式是什么？

我正在尝试使用$wp_admin_bar 删除几个默认的WordPress设计，但我找不到在哪里添加不会触发错误的$wp\\u admin\\u栏。

下面是我的代码The comments should help to understand what I have tried，以及我的思考过程是什么：

<?php

    defined( \'ABSPATH\' ) or die(\'Nothing to see here\');

// Since wp_admin_bar is a class I probably need to extend to it but I am unsure what 
//file needs to be required to achieve this
class adminPanel {

  //I tried adding it here
  //protected $wp_admin_bar;
  //I also tried public $wp_admin_bar

  //resgister() function is treated as something like a __construct and is called by a 
  //Init class so $wp_admin_bar can\'t be declared global before the class is 
  //instantiated
  public function register(){

      //Remove wordpress logo from top nav
      add_action( \'wp_before_admin_bar_render\', array( $this, \'remove_wp_logo\' ), 0 );


  }

  function remove_wp_logo() {
      //As pointed out in one of the answers "global $wp_admin_bar;" might 
      //be added here but this causes: Parse error: syntax error, 
      //unexpected \'global\' (T_GLOBAL)  
      $wp_admin_bar->remove_menu( \'wp-logo\' );
  }

}

在调用创建此类对象的类之前，我甚至尝试将其添加为全局。

if ( function_exists(\'add_action\') && class_exists(\'Init\')){
   global $wp_admin_bar;
   Init::register_services();
}

我遇到的错误是：

Fatal error: Uncaught Error: Call to a member function remove_menu() on null

我有一种感觉，我没有正确地调用$wp\\u admin\\u bar，但我也可能错误地知道错误的实际原因是什么。

我在这个网站上尝试了其他问题的解决方案，但到目前为止，所有问题都返回了相同的错误。

function remove_wp_logo() {
    global $wp_admin_bar;

    $wp_admin_bar->remove_menu( \'wp-logo\' );
}

add_action( \'admin_bar_menu\', function( \\WP_Admin_Bar $wp_admin_bar ) {
    new adminPanel( $wp_admin_bar );    
});

class adminPanel 
{
    private $admin_bar;
    
    public function __construct( \\WP_Admin_Bar $wp_admin_bar )
    {
        $this-admin_bar = $wp_admin_bar;
    }
}