wrong variable

index.php

@@ -46,7 +46,7 @@ if (isset($_GET['secret']) && $_GET['secret'] === REGISTRATION_PASSWORD) {
     curl_setopt($ch, CURLOPT_URL, SYNAPSE_URL.'/_matrix/client/v3/rooms/'.ROOM_ID.'/send/m.room.message/'.filter_var($_POST['nonce'], FILTER_SANITIZE_FULL_SPECIAL_CHARS));
     curl_setopt($ch, CURLOPT_PUT, true);
     curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode([
-        'body' => $decoded_response->user_id.' just registered',
+        'body' => '@'.$username.':imninja.net just registered',
         'msgtype' => 'm.text'
     ]));
     curl_setopt($ch, CURLOPT_HTTPHEADER, [
@@ -55,7 +55,7 @@ if (isset($_GET['secret']) && $_GET['secret'] === REGISTRATION_PASSWORD) {
     ]);
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
     $response = curl_exec($ch);
-    if ($curl_error($ch) || curl_getinfo($ch, CURLINFO_HTTP_CODE) !== 200) {
+    if (curl_error($ch) || curl_getinfo($ch, CURLINFO_HTTP_CODE) !== 200) {
         echo 'Registration for "'.$username.'" unsuccessful. Please try again later.';
         exit;
     }