WP_Rewrite::add_permastruct( string $name, string $struct, array $args = array() )

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Adds a new permalink structure.


A permalink structure (permastruct) is an abstract definition of a set of rewrite rules; it is an easy way of expressing a set of regular expressions that rewrite to a set of query strings. The new permastruct is added to the WP_Rewrite::$extra_permastructs array.

When the rewrite rules are built by WP_Rewrite::rewrite_rules(), all of these extra permastructs are passed to WP_Rewrite::generate_rewrite_rules() which transforms them into the regular expressions that many love to hate.

The $args parameter gives you control over how WP_Rewrite::generate_rewrite_rules() works on the new permastruct.


Name for permalink structure.
Permalink structure (e.g. category/%category%)
Arguments for building rewrite rules based on the permalink structure.

  • with_front bool
    Whether the structure should be prepended with WP_Rewrite::$front.
    Default true.
  • ep_mask int
    The endpoint mask defining which endpoints are added to the structure.
    Accepts a mask of:
    • EP_ALL
    • EP_NONE
    • EP_DATE
    • EP_DAY
    • EP_MONTH
    • EP_PAGES
    • EP_ROOT
    • EP_TAGS
    • EP_YEAR Default EP_NONE.
  • paged bool
    Whether archive pagination rules should be added for the structure.
    Default true.
  • feed bool
    Whether feed rewrite rules should be added for the structure. Default true.
  • forcomments bool
    Whether the feed rules should be a query for a comments feed. Default false.
  • walk_dirs bool
    Whether the 'directories' making up the structure should be walked over and rewrite rules built for each in-turn. Default true.
  • endpoints bool
    Whether endpoints should be applied to the generated rules. Default true.



public function add_permastruct( $name, $struct, $args = array() ) {
	// Back-compat for the old parameters: $with_front and $ep_mask.
	if ( ! is_array( $args ) ) {
		$args = array( 'with_front' => $args );

	if ( func_num_args() === 4 ) {
		$args['ep_mask'] = func_get_arg( 3 );

	$defaults = array(
		'with_front'  => true,
		'ep_mask'     => EP_NONE,
		'paged'       => true,
		'feed'        => true,
		'forcomments' => false,
		'walk_dirs'   => true,
		'endpoints'   => true,

	$args = array_intersect_key( $args, $defaults );
	$args = wp_parse_args( $args, $defaults );

	if ( $args['with_front'] ) {
		$struct = $this->front . $struct;
	} else {
		$struct = $this->root . $struct;

	$args['struct'] = $struct;

	$this->extra_permastructs[ $name ] = $args;



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