yii\log\Target::getContextMessage PHP Method

    protected function getContextMessage()
    {
        $context = ArrayHelper::filter($GLOBALS, $this->logVars);
        $result = [];
        foreach ($context as $key => $value) {
            $result[] = "\${$key} = " . VarDumper::dumpAsString($value);
        }
        return implode("\n\n", $result);
    }

 /**
  * {@inheritdoc}
  */
 public function export()
 {
     foreach ($this->messages as $message) {
         list($context, $level, $category, $timestamp, $traces) = $message;
         $extra = [];
         if ($context instanceof \Throwable || $context instanceof \Exception) {
             $this->client->captureException($context);
             $description = $context->getMessage();
         } elseif (isset($context['msg'])) {
             $description = $context['msg'];
             $extra = $context;
             unset($extra['msg']);
         } else {
             $description = $context;
         }
         if ($this->context) {
             $extra['context'] = parent::getContextMessage();
         }
         if (is_callable($this->extraCallback)) {
             $extra = call_user_func($this->extraCallback, $context, $extra);
         }
         $data = ['level' => static::getLevelName($level), 'timestamp' => $timestamp, 'message' => $description, 'extra' => $extra, 'tags' => ['category' => $category]];
         $this->client->capture($data, $traces);
     }
 }