<?php
$source = '{
"foo": "bar", // Comentário 1
"bar": 123 // Comentário 2
}';
PD9waHAKCiRzb3VyY2UgPSAnewogICJmb28iOiAiYmFyIiwgLy8gQ29tZW50w6FyaW8gMQogICJiYXIiOiAxMjMgLy8gQ29tZW50w6FyaW8gMgp9JzsKCnZhcl9kdW1wKGpzb25fZGVjb2RlKCRzb3VyY2UpLCBqc29uX2xhc3RfZXJyb3JfbXNnKCkpOwo=