How to get the ID for a specif permalink

Hi there,

I’m trying to get the ID for each of my page so I can use it in another function, but all that I’ve read is how to get the ID inside the loop or for the actual post/page.

Here is my problem, having the following:

<ul id="menu-pages">
  <li class="page_item page-item-4">
    <a title="Home" href="https://mysite.com">Home</a>
  </li>
  <li class="page_item page-item-6">
    <a title="Portfolio" href="https://mysite.com/portfolio/">Portfolio</a>
  </li>
  ...
</ul>

How can I get the ID for each of those pages. I see know that the last class of the li has the id, but is there another way?