Hello world
Same example as 01-hello-world, but uses Standard Http Server instead of manual parsing of incoming data.
Run locally
php -S localhost:8080 ./graphql.php
Try query
curl -d '{"query": "query { echo(message: \"Hello World\") }" }' -H "Content-Type: application/json" http://localhost:8080
Try mutation
curl -d '{"query": "mutation { sum(x: 2, y: 2) }" }' -H "Content-Type: application/json" http://localhost:8080