add_rewrite_endpoint( string $name, int $places, string|bool $query_var = true )

Add an endpoint, like /trackback/.


Adding an endpoint creates extra rewrite rules for each of the matching places specified by the provided bitmask. For example:

add_rewrite_endpoint( 'json', EP_PERMALINK | EP_PAGES );

will add a new rewrite rule ending with "json(/(.*))?/?$" for every permastruct that describes a permalink (post) or page. This is rewritten to "json=$match" where $match is the part of the URL matched by the endpoint regex (e.g. "foo" in "[permalink]/json/foo/").

A new query var with the same name as the endpoint will also be created.

When specifying $places ensure that you are using the EP_* constants (or a combination of them using the bitwise OR operator) as their values are not guaranteed to remain static (especially EP_ALL).

Be sure to flush the rewrite rules – see flush_rewrite_rules() – when your plugin gets activated and deactivated.



(string) (Required) Name of the endpoint.


(int) (Required) Endpoint mask describing the places the endpoint should be added.


(string|bool) (Optional) Name of the corresponding query variable. Pass false to skip registering a query_var for this endpoint. Defaults to the value of $name.

Default value: true


File: wp-includes/rewrite.php

function add_rewrite_endpoint( $name, $places, $query_var = true ) {
	global $wp_rewrite;
	$wp_rewrite->add_endpoint( $name, $places, $query_var );


Version Description
WP-4.3.0 Added support for skipping query var registration by passing false to $query_var.
WP-2.1.0 Introduced.