Update examples/02-shorthand (#868)

Author: spawnia

examples/02-shorthand/README.md renamed to examples/02-schema-definition-language/README.md

@@ -1,7 +1,7 @@
-# Parsing GraphQL IDL shorthand
+# Schema Definition Language
 
-Same as the Hello world example but shows how to build GraphQL schema from shorthand 
-and wire up some resolvers
+Same as the Hello world example, but shows how to use schema definition language
+and wire up some resolvers as plain functions.
 
 ### Run locally
 ```

examples/02-schema-definition-language/graphql.php

@@ -0,0 +1,45 @@
+<?php
+
+declare(strict_types=1);
+
+// Test this using the following command:
+// php -S localhost:8080 graphql.php
+
+// Try the following example queries:
+// curl http://localhost:8080 -d '{"query": "query { echo(message: \"Hello World\") }" }'
+// curl http://localhost:8080 -d '{"query": "mutation { sum(x: 2, y: 2) }" }'
+
+require_once __DIR__ . '/../../vendor/autoload.php';
+
+use GraphQL\GraphQL;
+use GraphQL\Utils\BuildSchema;
+
+try {
+    $schema    = BuildSchema::build(/** @lang GraphQL */ '
+    type Query {
+      echo(message: String!): String!
+      sum(x: Int!, y: Int!): Int!
+    }
+    ');
+    $rootValue = [
+        'echo' => static fn (array $rootValue, array $args): string => $rootValue['prefix'] . $args['message'],
+        'sum' => static fn (array $rootValue, array $args): int => $args['x'] + $args['y'],
+        'prefix' => 'You said: ',
+    ];
+
+    $rawInput       = file_get_contents('php://input');
+    $input          = json_decode($rawInput, true);
+    $query          = $input['query'];
+    $variableValues = $input['variables'] ?? null;
+
+    $result = GraphQL::executeQuery($schema, $query, $rootValue, null, $variableValues);
+} catch (Throwable $e) {
+    $result = [
+        'error' => [
+            'message' => $e->getMessage(),
+        ],
+    ];
+}
+
+header('Content-Type: application/json; charset=UTF-8');
+echo json_encode($result);

examples/02-shorthand/graphql.php

@@ -12,6 +12,7 @@
     <file>benchmarks</file>
     <file>examples/00-hello-world</file>
     <file>examples/01-blog</file>
+    <file>examples/02-schema-definition-language</file>
     <file>src</file>
     <file>tests</file>
 

examples/02-shorthand/rootvalue.php

@@ -7,6 +7,7 @@ parameters:
         - %currentWorkingDirectory%/benchmarks
         - %currentWorkingDirectory%/examples/00-hello-world
         - %currentWorkingDirectory%/examples/01-blog
+        - %currentWorkingDirectory%/examples/02-schema-definition-language
         - %currentWorkingDirectory%/src
         - %currentWorkingDirectory%/tests