Amend Wordpress

Author: estringana

src/DDTrace/Integrations/WordPress/WordPressIntegrationLoader.php

@@ -742,7 +742,7 @@ function_exists('is_404') && is_404() === false) {
                         // (?:([^/]+)-)? absent vs present) get distinct cache entries.
                         $wpParticipation = null;
                         if ($urlPath !== null) {
-                            if (@preg_match('#^' . $matchedRule . '#', ltrim($urlPath, '/'), $_wpc)) {
+                            if (@preg_match('#^' . $matchedRule . '#', trim($urlPath, '/'), $_wpc)) {
                                 $_bits = [];
                                 for ($_wi = 1; $_wi < count($_wpc); $_wi++) {
                                     $_bits[] = (isset($_wpc[$_wi]) && $_wpc[$_wi] !== '') ? '1' : '0';

src/DDTrace/Util/RouteNormalizer.php

@@ -110,7 +110,11 @@ public static function normalizeFromWordPress(string $matchedRule, $urlPath = nu
         // that didn't participate are skipped instead of emitting phantom params.
         $matchedGroups = null;
         if ($urlPath !== null) {
-            if (@preg_match('#^' . $matchedRule . '#', ltrim($urlPath, '/'), $captures)) {
+            // Strip both leading and trailing slashes: WordPress $wp->request often includes
+            // a trailing slash, but many WordPress regex rules end with `$` (no `/?`), so a
+            // trailing slash causes the match to fail and leaves $matchedGroups null — which
+            // then treats all optional capture groups as present and produces the wrong shape.
+            if (@preg_match('#^' . $matchedRule . '#', trim($urlPath, '/'), $captures)) {
                 $matchedGroups = [];
                 for ($i = 1; $i < count($captures); $i++) {
                     if (isset($captures[$i]) && $captures[$i] !== '') {