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I'm trying to create a custom url rewrite for my wordpress plugin.

function insert_plugin_rewrite_rule($rules) {
    global $wp, $wp_rewrite;
    $ret = $wp_rewrite->add_rule('updates/plugins/([^/]+)/', 'index.php?update_slug=$matches[1]', 'top');

    // Remove when debugging is done.

add_filter('init', 'insert_plugin_rewrite_rule');

And to try and intercept it:

function blah() {
    global $wp;
    echo "<pre>";print_r($GLOBALS['wp']->query_vars['update_slug']);echo "</pre>";
add_filter('init', 'blah');

When I'm in the 'blah' function, it shows that my update_slug query var has been registered, and that my url has been registered too. But when I go to /updates/plugins/123/ it doesn't show any query_vars have been set.

Am I doing this right, or is there some subtle thing I'm missing?

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migrated from stackoverflow.com Jul 23 '12 at 20:32

This question came from our site for professional and enthusiast programmers.

It may also we worth noting that I'm doing my init of 'blah' a few lines after my init of 'insert_plugin_rewrite_rule' in my plugin's main file. – Jack Slingerland Jul 23 '12 at 15:45
up vote 3 down vote accepted

first, you should use the proper filter and method to add query vars and rewrite rules and not manipulate the globals directly. the other issue I believe is your regex pattern, this is working for me:

add_filter( 'query_vars', 'wpa59404_query_vars' );
function wpa59404_query_vars($query_vars){
    $query_vars[] = 'update_slug';
    return $query_vars;

add_action( 'init', 'wpa59404_rewrites' );
function wpa59404_rewrites(){
share|improve this answer
hey Milo will this work in a functions file of a theme also? – pythonian29033 Oct 22 '13 at 8:11

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