- if (!is_array($val) && (!is_object($val) || method_exists($val, '__toString'))) {
- $replace[sprintf('{%s}', $key)] = $val;
+ if (null === $val || is_scalar($val) || (\is_object($val) && method_exists($val, '__toString'))) {
+ $replacements["{{$key}}"] = $val;
+ } elseif ($val instanceof \DateTimeInterface) {
+ $replacements["{{$key}}"] = $val->format(\DateTime::RFC3339);
+ } elseif (\is_object($val)) {
+ $replacements["{{$key}}"] = '[object '.\get_class($val).']';
+ } else {
+ $replacements["{{$key}}"] = '['.\gettype($val).']';