Wordpress: Get post/page slug

the-slug-function.php

<?php 
// Custom function to return the post slug
function the_slug($echo=true){
  $slug = basename(get_permalink());
  do_action('before_slug', $slug);
  $slug = apply_filters('slug_filter', $slug);
  if( $echo ) echo $slug;
  do_action('after_slug', $slug);
  return $slug;
}
?>

the-slug.php

<?php if (function_exists('the_slug')) { the_slug(); } ?>