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$ php -S localhost:8000
PHP 5.6.30 Development Server started at Mon Jul  3 09:48:10 2017
Listening on http://localhost:8000
Document root is /Users/jmather/code/php/graphql-mapper-demo
Press Ctrl-C to quit.
curl -XPOST 'http://localhost:8000/entry.php' -d 'query=query FooBar {
    luke: hero(episode: EMPIRE) {
        id,
        name,
        friends {
            id, name
        }
    },
    droid(id: "2001") {
        primaryFunction
    }
}'
[Mon Jul  3 09:48:36 2017] ::1:56052 [200]: /entry.php - Call to a member function addImplementation() on string in /Users/jmather/code/php/graphql-mapper-demo/vendor/webonyx/graphql-php/src/Type/Definition/InterfaceType.php on line 54

    /**
     * Queue the update of the interfaces to know about this implementation.
     * This is an rare and unfortunate use of mutation in the type definition
     * implementations, but avoids an expensive "getPossibleTypes"
     * implementation for Interface types.
     *
     * @param ObjectType $impl
     */
    public static function addImplementationToInterfaces(ObjectType $impl)
    {
        self::$_lazyLoadImplementations[] = function() use ($impl) {
            /** @var self $interface */
            foreach ($impl->getInterfaces() as $interface) {
                $interface->addImplementation($impl); // here
            }
        };
    }