logout_url is a filter applied to the url returned by the function wp_logout_url()
add_filter( 'logout_url', 'my_logout_page', 10, 2 ); function my_logout_page( $logout_url, $redirect ) { return home_url( '/my-logout-page/?redirect_to=' . $redirect ); }
Since: Version 2.8
logout_url is located in wp-includes/general-template.php