[wp-trac] [WordPress Trac] #20861: switch_to_blog() breaks custom post type permalinks

[WordPress Trac]

#20861: switch_to_blog() breaks custom post type permalinks
--------------------------+----------------------
 Reporter:  sickhippie    |       Owner:  (none)
     Type:  defect (bug)  |      Status:  closed
 Priority:  normal        |   Milestone:
Component:  Multisite     |     Version:
 Severity:  normal        |  Resolution:  wontfix
 Keywords:  close         |     Focuses:
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Comment (by mennoll):

 I was able to make a fix you can put in your themes `functions.php` file.
 It works when your permalink structure is set to `/%postname%/` .
 I have not tested other permalink structures, but maybe this can still
 help you to find the right solution.

 {{{#!php
 <?php
         /**
          * Fix multisite custom post type permalinks after switching blogs
          * @see https://core.trac.wordpress.org/ticket/20861
          *
          * @param string $post_link
          * @param WP_Post $post
          * @return string
          */
          function fix_multisite_cpt_permalinks( $post_link, $post ) {
                 // Only run if switched to other site
                 if ( ! isset( $GLOBALS['switched'] ) || !
 $GLOBALS['switched'] || empty( $GLOBALS['_wp_switched_stack'] ) ) {
                         return $post_link;
                 }

                 // Only run if permalink structure is %postname%
                 $current_permalink_structure = get_option(
 'permalink_structure' );
                 if ( $current_permalink_structure !== '/%postname%/' ) {
                         return $post_link;
                 }

                 // Get post type url prefix
                 $url_prefix       = $post->post_type;
                 $post_type_object = get_post_type_object( $post->post_type
 );
                 if ( $post_type_object instanceof WP_Post_Type && ! empty(
 $post_type_object->rewrite ) && array_key_exists( 'slug',
 $post_type_object->rewrite ) ) {
                         $url_prefix = $post_type_object->rewrite['slug'];
                 }

                 // Generate post permalink
                 $post_link = home_url( '/' . $url_prefix . '/' .
 $post->post_name . '/' );

                 return $post_link;
         }
         add_filter( 'post_type_link', 'fix_multisite_cpt_permalinks', 10,
 2 );
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/20861#comment:19>
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