I have a problem writing a plugin for wordpress. First, I register a new query_var and add a new rewrite rule:

function nng_users_query_vars( $vars ) {
    array_push( $vars, 'nng_users' );
    return $vars;
add_filter('query_vars', 'nng_users_query_vars');

function nng_users_rewrite_rules( $rules ) {
$newrules = array(
                        'benutzer/([^/]+)/?$' => 'index.php?pagename=nng_users&nng_users=$matches[1]'
$finalrules = $newrules + $rules;
    return $finalrules;

This works perfectly, but I cannot grab any query_var from the plugin. Typing:

print_r( $wp_query->query_var );


echo $wp_query->query_var['some_var'];

does not show anything. But why? If I put the exact same thing into the function of my theme, it works. If I put it into a function and call this function in my theme, it works... Background is the following: I want to create a custom user system and therefore I need to check my custom query var to e.g. logout or header-redirect.

Thanks in advance

  • and of course I tried to global $wp_query – clash Jul 29 '12 at 11:54
  • is $wp_query->query_var a typo? it's plural: $wp_query->query_vars – Milo Jul 29 '12 at 13:47
  • its a typo, sry about that. I used $wp_query->query_vars of course – clash Jul 29 '12 at 15:21

Late answer, but for everybody else looking for it, this works:


| improve this answer | |
  • Kind of a pointless answer, just pointing to the doc for the function. You should at least post the relevant part of the code that helped you. – The Unknown Dev Oct 20 '16 at 16:08

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