The post slug is the part of the URL of a post or page at the last section. E.g.:
There are two ways to get the slug in WordPress inside the loop. The first way is to access the
$post object that is available inside the loop.
$slug = $post->post_name;
The second way is to pass the whole permalink to the
basename function, which will automatically process the URL and give us only the slug.
$slug = basename(get_permalink());