WordPress get_permalink() inside Ad Inserter block not working

Question

<?php 
  // query db once for permalink
  $permalink = urlencode(get_permalink());
?>

<a href='https://www.facebook.com/sharer/sharer.php?u=<?php echo $permalink; ?>' onclick='javascript:return (function(){window.open("https://www.facebook.com/sharer/sharer.php?u=<?php echo $permalink; ?>", "MsgWindow", "width=600, height=600, scrollbars=yes", false); return false;})();'>
<img onmouseover="this.style.opacity='0.8'" onmouseout="this.style.opacity='1'" style="margin-right:5px; width:40px; height:40px" src="data:image/png;base64,..." alt="Facebook Share" />
</a>

The above code executes in an Ad Inserter block but returns the wrong permalink. I have no other plugins installed for debugging purposes so that means no caching enabled.

The code executes w/o error but doesn't return the correct URL.

What could be wrong?

Answer 1

Try this:

get_the_permalink()

https://developer.wordpress.org/reference/functions/get_the_permalink/

And I don't think you have to urlencode() it.

Edit : It works only in the loop without any parameters. Outside the loop you have to pass the Post ID to the function.