How to pass extra variables in URL with WordPress

Question

I am having trouble trying to pass an extra variable in the url to my WordPress installation    For example  news c 123  For some reason  it works only on the website root www example com c 123 but it does not work if the url contains any more information www example com news c 123  I have the following code in my functions php file in the theme directory   if  isset   GET  c          setcookie  cCookie     GET  c         if  isset   SERVER  HTTP REFERER         setcookie  rCookie     SERVER  HTTP REFERER         Any Ideas

User · Accepted Answer

There are quite few solutions to tackle this issue. First you can go for a plugin if you want:

WordPress Quickie: Custom Query String Plugin

Or code manually, check out this post:

Passing Query String Parameters in WordPress URL

Also check out:

add_query_arg

User · Answer

One issue you might run into is is home   returns true when a registered query var is present in the home URL  For example  if http   example com displays a static page instead of the blog  http   example com  c 123 will return the blog    See https   core trac wordpress org ticket 25143 and https   wordpress org support topic adding-query-var-makes-front-page-missing  for more info on this   What you can do  if you re not attempting to affect the query  is use add rewrite endpoint    It should be run during the init action as it affects the rewrite rules  Eg   add action   init    add custom setcookie rewrite endpoints      function add custom setcookie rewrite endpoints           add  c 123 endpoint with       EP ALL so endpoint is present across all places       no effect on the query vars     add rewrite endpoint   c   EP ALL   query vars   false        This should give you access to   GET  c   when the url contains more information like www example com news c 123   Remember to flush your rewrite rules after adding modifying this

User · Answer

lt  php  edit post   add query arg  c    123    news        gt    lt a href   lt  php echo  edit post    gt   gt Go to New page lt  a gt    You can add any page inplace of  news

User · Answer

add following code in function php  add filter   query vars    addnew query vars   10  1    function addnew query vars  vars            vars      var1      var1 is the name of variable you want to add            return  vars      then you will b able to use   GET  var1

User · Answer

Since this is a frequently visited post i thought to post my solution in case it helps anyone  In WordPress along with using query vars you can change permalinks too like this  www example com c 123 to www example com c 123   For this you have to add these lines of code in functions php or your plugin base file   From shankhan s anwer  add filter   query vars    addnew query vars   10  1    function addnew query vars  vars            vars      c      c is the name of variable you want to add            return  vars      And additionally this snipped to add custom rewriting rules   function custom rewrite basic          add rewrite rule   c   0-9          c  1    top      add action  init    custom rewrite basic      For the case where you need to add rewrite rules for a specifc page you can use that page slug to write a rewrite rule for that specific page  Like in the question OP has asked about  www example com news c 123 to www example com news 123   We can change it to the desired behaviour by adding a little modification to our previous function   function custom rewrite basic          add rewrite rule   news   0-9         news c  1    top      add action  init    custom rewrite basic      Hoping that it becomes useful for someone

User · Answer

To make the round trip  quot The WordPress Way quot  on the  quot front-end quot   doesn t work in the context of wp-admin   you need to use 3 WordPress functions   add query arg   - to create the URL with your new query variable   c  in your example  the query vars filter - to modify the list of public query variables that WordPress knows about  this only works on the front-end  because the WP Query is not used on the back end - wp-admin - so this will also not be available in admin-ajax  get query var   - to retrieve the value of your custom query variable passed in your URL   Note  there s no need to even touch the superglobals    GET  if you do it this way  Example On the page where you need to create the link   set the query variable  if it s a link back to this page  just adding the query variable  lt a href  quot  lt  php echo esc url  add query arg   c    my value for c      gt  quot  gt  if it s a link to some other page  lt a href  quot  lt  php echo esc url  add query arg   c    my value for c  site url    some other page          gt  quot  gt  In your functions php  or some plugin file or custom class  front-end only   function add custom query var   vars       vars      quot c quot     return  vars    add filter   query vars    add custom query var      On the page   function where you wish to retrieve and work with the query var set in your URL   my c   get query var   c     On the Back End  wp-admin  On the back end we don t ever run wp    so the main WP Query does not get run  As a result  there are no query vars and the query vars hook is not run  In this case  you ll need to revert to the more standard approach of examining your   GET superglobal  The best way to do this is probably   my c   filter input  INPUT GET   quot c quot   FILTER SANITIZE STRING    though in a pinch you could do the tried and true  my c   isset    GET  c       GET  c      quot  quot   or some variant thereof

User · Answer

This was the only way I could get this to work  add action  init   add query args    function add query args          add query arg   var1    val1         http   codex wordpress org Function Reference add query arg

User · Answer

to add parameter to post urls  to perma-links   i use this   add filter   post type link    append query string   10  2    function append query string   url   post          return add query arg  my pid   post- gt ID   url       output   http   yoursite com pagename my pid 12345678

[php] How to pass extra variables in URL with WordPress

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