Add extra parameters after permalink?

3 comments

1. You can add an endpoint to your URIs to handle special requests.

   Here is a basic example as plugin. To understand what’s going on read Christopher Davis‘s fantastic tutorial A (Mostly) Complete Guide to the WordPress Rewrite API.

   <?php # -*- coding: utf-8 -*-
   /**
    * Plugin Name: T5 Endpoint Example
    * Description: Adds a permalink endpoint to posts named <code>epex</code>
    */
   
   add_action( 'init', 't5_add_epex' );
   
   function t5_add_epex()
   {
       add_rewrite_endpoint( 'epex', EP_PERMALINK );
   }
   
   add_action( 'template_redirect', 't5_render_epex' );
   
   /**
    * Handle calls to the endpoint.
    */
   function t5_render_epex()
   {
       if ( ! is_singular() or ! get_query_var( 'epex' ) )
       {
           return;
       }
   
       // You will probably do something more productive.
       $post = get_queried_object();
       print '<pre>' . htmlspecialchars( print_r( $post, TRUE ) ) . '</pre>';
       exit;
   }
   
   
   add_filter( 'request', 't5_set_epex_var' );
   
   /**
    * Make sure that 'get_query_var( 'epex' )' will not return just an empty string if it is set.
    *
    * @param  array $vars
    * @return array
    */
   function t5_set_epex_var( $vars )
   {
       isset( $vars['epex'] ) and $vars['epex'] = true;
       return $vars;
   }
   

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2. You can do this with the Rewrite API‘s add_rewrite_endpoint:

   add_action( 'init', 'wpse51444_endpoint' );
   function wpse51444_endpoint(){
       add_rewrite_endpoint( 'related', EP_ALL );
   }
   
   add_filter( 'query_vars', 'wpse51444_query_vars' );
   function wpse51444_query_vars( $query_vars ){
       // add related to the array of recognized query vars
       $query_vars[] = 'related';
       return $query_vars;
   }
   

   In the template you can detect when your related query var is present:

   if( array_key_exists( 'related' , $wp_query->query_vars ) ):
       // current request ends in related
   endif;
   

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3. to add parameter to post url (permalink), i use like this:

   add_filter( 'post_type_link', 'append_query_string', 10, 2 );
   function append_query_string( $url, $post ) 
   {
       return $url.'?my_pid='.$post->ID;
   }
   

   output:

   http://yoursite.com/pagename?my_pid=12345678

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