PHP Bugs: Confusing Non-Objects for Objects (Example F)

php_bugs_4f.php

<?php

function exchange_send_message_raw($context, $content)
{
  $location = "https://test.cotten.io/exchange/raw_message.php";
  $request = array('direction' => 1, // outgoing
                   'context'   => $context,
                   'content'   => json_encode($content));
  $response = ProxyPostClient::request($location, $request);
  $response_obj = json_decode($response);

  if (!empty($response_obj) && isset($response_obj->content)) {
    print_formatted_log("Exchange Response: Success");
    print_formatted_log(json_encode($response_obj));
    echo "\n";
  } else {
    print_formatted_log("Exchange Response: Error");
    print_formatted_log(json_encode($response_obj));
    print_formatted_log($response); // raw text response
    echo "\n";
  }

  return $response_obj->content;
}