Implement suggestion

Props mrsdizzie

Author: swissspidy

features/plugin-search.feature

@@ -18,3 +18,12 @@ Feature: Search WordPress.org plugins
       """
       name,slug,active_installs
       """
+
+  Scenario: Search for plugins with url field
+    Given a WP install
+
+    When I run `wp plugin search gutenberg --fields=slug,url --format=csv`
+    Then STDOUT should contain:
+      """
+      gutenberg,https://wordpress.org/plugins/gutenberg/
+      """

src/WP_CLI/CommandWithUpgrade.php

@@ -854,8 +854,8 @@ protected function _search( $args, $assoc_args ) {
 
 		// Add `url` for plugin or theme on wordpress.org.
 		foreach ( $items as $index => $item_object ) {
-			if ( $item_object instanceof \stdClass ) {
-				$item_object->url = "https://wordpress.org/{$plural}/{$item_object->slug}/";
+			if ( is_array( $item_object ) ) {
+				$items[ $index ]['url'] = "https://wordpress.org/{$plural}/{$item_object['slug']}/";
 			}
 		}