在过去的几天里，我一直在尝试将我创建的代码添加到我的菜单中。。。没有成功

这是我的代码：https://www.w3schools.com/code/tryit.asp?filename=GO9AAZCNLK4E

至我的网站：https://www.dm-gaming.eu/

这是我尝试的代码的一部分；标题。php“；

<div class="menujeu">
<div class="dropdown">
<button class="dropbtn">HACK & SLASH
<i class="fa fa-caret-down"></i>
</button>
<div class="dropdown-content">
<?php
wp_nav_menu([
\'theme_location\' => \'menu-under\',
\'container\' => false,
\'menu_class\' => \'menujeu\' ])
?>
<a href="https://www.dm-gaming.eu/chronicon/">Chronicon</a>
<a href="https://www.dm-gaming.eu/diablo-iii/">Diablo 3</a>
<a href="https://www.dm-gaming.eu/diablo-4/">Diablo 4</a>
<a href="https://www.dm-gaming.eu/dreamscaper/">DreamScaper</a>
<a href="https://www.dm-gaming.eu/grim-dawn/">Grim Dawn</a>
<a href="https://www.dm-gaming.eu/Hammerwatch/">HammerWatch</a>
<a href="https://www.dm-gaming.eu/hero-siege/">Hero Siege</a>
<a href="https://www.dm-gaming.eu/Last-Epoch/">Last Epoch</a>
<a href="https://www.dm-gaming.eu/Lost-Ark/">Lost Ark</a>
<a href="https://www.dm-gaming.eu/path-of-exile/">Path of Exile</a>
<a href="https://www.dm-gaming.eu/path-of-exile-2/">Path of Exile 2</a>
<a href="https://www.dm-gaming.eu/warhammer-chaosbane/">Warhammer Chaosbane</a>
<a href="https://www.dm-gaming.eu/Wolcen/">Wolcen</a>
</div>
</div>

非常感谢！