Extract slug from permalink

2 comments

1. Split the string by the slashes and take the last bit:

   $url = "http://sitename.com/category/best-post";
   $parts = explode("/", $url);
   echo $parts[count($parts) - 1]; // best-post
   

2. You can simply use the global $post object like below:
   within the loop you can use,
   global $post;
   $post_slug=$post->post_name;

   or

   global $post;
   $slug = get_post( $post )->post_name;
   

   and outside the loop you can do it like this,
   global $wp_query;
   $post_id = $wp_query->post->ID

   $post = get_post( $post_id );
   $slug = $post->post_name;
   

   Not tested 100% but it should work for you

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