I am trying to pass a variable from the url into a wordpress post.

1) I added add_query_var into functions.php, to retrieve the query string from the url

add_filter( 'init', 'add_model_more_query_var' );
function add_model_more_query_var()
    global $wp;
    $wp->add_query_var( 'model_more' );

2) I can retrieved the variable in my post with:

get_query_var( 'model_more', 1 );

The url structure that I am using is:





Now I am trying to make the urls pretty, and rewrite them from




This is where I am stuck.

I have the following rewrite rule, but I get a 404 when I try to access the pretty url:

function add_model_more_rewrite_rule()
  • One issue I see is that you're using ^model_more in your RegEx, where ^ specifies the beginning of the string (in the case of add_rewrite_rule this means the requested URL path). So, if your path is "/model/benze/model_more/5/", the ^model_more will never match since the beggingin of the math is /model/.
    – phatskat
    Jan 26, 2018 at 15:09
  • Is model/benz a custom post type? Jan 26, 2018 at 15:12
  • model = custom post type and benz = post title
    – Philip
    Jan 26, 2018 at 15:36

1 Answer 1


There are a couple of issues with your regular expression:

^--- Says "match start of line"

In your URLs, the start of the line is actually /model/, so ^model_more will never match. Instead, try a regex like this:

  • [^/]+ says "match anything except /, since I would guess there are multiple models under /model/.
  • (\d+) ensures that only digits are captured - (\d*) would capture anything after the number.
  • /?$ says "the end of the line might be preceded by a slash, but not necessarily.

Edit: You can see the regex in action at https://regex101.com/r/OhOFTD/1

  • I dont get the 404 anymore :), but wordpress is directing the url to template archive.php, and not to single.php. domain.com/model/benz/?model_more=5 -> single-model.php and domain.com/model/benz/model_more/5 -> archive.php
    – Philip
    Jan 26, 2018 at 15:46
  • If you go to /index.php?model_more=5 do you get the page you're expecting?
    – phatskat
    Jan 26, 2018 at 15:52
  • no, i have to go to: /?model=benz&model_more=5 "model" is the custom post type, "Benz" is the post slug, and "model_more" the query var.
    – Philip
    Jan 26, 2018 at 16:27
  • Gotcha, so try this: ^model/([^/]+)/model_more/(\d+)/?$ and then for the second parameter: index.php?model=$matches[1]&model_more=$matches[2]
    – phatskat
    Jan 26, 2018 at 17:38

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