removing category form slug

functions.php

add_filter('request', 'change_term_request', 1, 1 );
function change_term_request($query){
  $tax_name = 'category';

  if( $query['attachment'] ) :
    $include_children = true;
    $name = $query['attachment'];
  else:
    $include_children = false;
    $name = $query['name'];
  endif;

  $term = get_term_by('slug', $name, $tax_name);

  if (isset($name) && $term && !is_wp_error($term)):
    if( $include_children ) {
      unset($query['attachment']);
      $parent = $term->parent;
      while( $parent ) {
        $parent_term = get_term( $parent, $tax_name);
        $name = $parent_term->slug . '/' . $name;
        $parent = $parent_term->parent;
      }
    } else {
      unset($query['name']);
    }

    switch( $tax_name ):
      case 'category':{
        $query['category_name'] = $name;
        break;
      }
      case 'post_tag':{
        $query['tag'] = $name;
        break;
      }
      default:{
        $query[$tax_name] = $name;
        break;
      }
    endswitch;
  endif;

  return $query;
}
add_filter( 'term_link', 'change_term_permalink', 10, 3 );
function change_term_permalink( $url, $term, $taxonomy ){

  $taxonomy_name = 'category'; // your taxonomy name here
  $taxonomy_slug = 'category'; // the taxonomy slug can be different with the taxonomy name (like 'post_tag' and 'tag' )

  if ( strpos($url, $taxonomy_slug) === FALSE || $taxonomy != $taxonomy_name ) return $url;

  $url = str_replace('/' . $taxonomy_slug, '', $url);

  return $url;
}
add_action('template_redirect', 'change_old_term_redirect');
function change_old_term_redirect() {

  $taxonomy_name = 'category';
  $taxonomy_slug = 'category';

  if( strpos( $_SERVER['REQUEST_URI'], $taxonomy_slug ) === FALSE)
    return;

  if( ( is_category() && $taxonomy_name=='category' ) || ( is_tag() && $taxonomy_name=='post_tag' ) || is_tax( $taxonomy_name ) ) :
    wp_redirect( site_url( str_replace($taxonomy_slug, '', $_SERVER['REQUEST_URI']) ), 301 );
    exit();
  endif;
}

Hi,

Thanks for the code, but I'm getting errors from this part of the code $query['attachment'] & $query['name'] ...

**if( $query['attachment'] ) :**
	$include_children = true;
	$name             = $query['attachment'];
else:
	$include_children = false;
	**$name             = $query['name'];**
endif;

Do you see the same issue?