Simplify ping response check: do not parse response body.

README.md

@@ -24,4 +24,5 @@ At the moment the same as of legacy plugin.
 * Remove survey nag and related functionality.
 * Removed optional usage tracking via Google Analytics.
 * Remove functionality that depended on Subversion (SVN) being used for code versioning.
+* Simplify ping response check: do not parse response body.
 * Integrate with [GitHub Updater](https://github.com/afragen/github-updater) - the plugin can only be updated from GitHub, never from WordPress.org Plugin Directory.

sitemap-core.php

@@ -1877,15 +1877,13 @@ protected function ExecutePing($pingUrl, $updateStatus = true) {
 				$pings["google"] = array(
 					"name" => "Google",
 					"url" => "https://www.google.com/ping?sitemap=%s",
-					"check" => "Your Sitemap has been successfully added to our list of Sitemaps to crawl."
 				);
 			}
 
 			if ($this->GetOption("b_pingmsn")) {
 				$pings["bing"] = array(
 					"name" => "Bing",
 					"url" => "https://www.bing.com/ping?sitemap=%s",
-					"check" => "Thanks for submitting your Sitemap."
 				);
 			}
 
@@ -1895,7 +1893,7 @@ protected function ExecutePing($pingUrl, $updateStatus = true) {
 
 				$pingres = $this->RemoteOpen($url);
 
-				if ($pingres === null || $pingres === false || strpos($pingres, $service["check"]) === false) {
+				if (!$pingres) {
 					$status->EndPing($serviceId, false);
 					trigger_error("Failed to ping $serviceId: " . htmlspecialchars(strip_tags($pingres)), E_USER_NOTICE);
 				} else {