diff --git a/src/DebugBar/DataCollector/MessagesCollector.php b/src/DebugBar/DataCollector/MessagesCollector.php
index 8859e7d..308a203 100644
--- a/src/DebugBar/DataCollector/MessagesCollector.php
+++ b/src/DebugBar/DataCollector/MessagesCollector.php
@@ -195,7 +195,7 @@ class MessagesCollector extends AbstractLogger implements DataCollectorInterface
     /**
      * Interpolates context values into the message placeholders.
      *
-     * @param $message
+     * @param string $message
      * @param array $context
      * @return string
      */
@@ -204,9 +204,24 @@ class MessagesCollector extends AbstractLogger implements DataCollectorInterface
         // build a replacement array with braces around the context keys
         $replace = array();
         foreach ($context as $key => $val) {
+            $placeholder = '{' . $key . '}';
+            if (strpos($message, $placeholder) === false) {
+                continue;
+            }
             // check that the value can be cast to string
-            if (!is_array($val) && (!is_object($val) || method_exists($val, '__toString'))) {
-                $replace['{' . $key . '}'] = $val;
+            if (null === $val || is_scalar($val) || (is_object($val) && method_exists($val, "__toString"))) {
+                $replace[$placeholder] = $val;
+            } elseif ($val instanceof \DateTimeInterface) {
+                $replace[$placeholder] = $val->format("Y-m-d\TH:i:s.uP");
+            } elseif ($val instanceof \UnitEnum) {
+                $replace[$placeholder] = $val instanceof \BackedEnum ? $val->value : $val->name;
+            } elseif (is_object($val)) {
+                $replace[$placeholder] = '[object ' . $this->getDataFormatter()->formatClassName($val) . ']';
+            } elseif (is_array($val)) {
+                $json = @json_encode($val);
+                $replace[$placeholder] = false === $json ? 'null' : 'array' . $json;
+            } else {
+                $replace[$placeholder] = '['.gettype($val).']';
             }
         }
 
diff --git a/src/DebugBar/DataFormatter/DataFormatter.php b/src/DebugBar/DataFormatter/DataFormatter.php
index d933f34..b77f175 100644
--- a/src/DebugBar/DataFormatter/DataFormatter.php
+++ b/src/DebugBar/DataFormatter/DataFormatter.php
@@ -84,4 +84,23 @@ class DataFormatter implements DataFormatterInterface
         $suffixes = array('B', 'KB', 'MB', 'GB', 'TB');
         return $sign . round(pow(1024, $base - floor($base)), $precision) . $suffixes[(int) floor($base)];
     }
+
+    /**
+     * @param object $object
+     * @return string
+     */
+    public function formatClassName($object)
+    {
+        $class = \get_class($object);
+
+        if (false === ($pos = \strpos($class, "@anonymous\0"))) {
+            return $class;
+        }
+
+        if (false === ($parent = \get_parent_class($class))) {
+            return \substr($class, 0, $pos + 10);
+        }
+
+        return $parent . '@anonymous';
+    }
 }