Extracts new function, marshalMethodFromSapi()

Since we're doing this for headers, the URI, and the protocol version,
makes sense to make this a function as well.

Author: weierophinney

composer.json

@@ -40,6 +40,7 @@
     "files": [
         "src/functions/create_uploaded_file.php",
         "src/functions/marshal_headers_from_sapi.php",
+        "src/functions/marshal_method_from_sapi.php",
         "src/functions/marshal_protocol_version_from_sapi.php",
         "src/functions/marshal_uri_from_sapi.php",
         "src/functions/normalize_server.php",

src/ServerRequestFactory.php

@@ -92,7 +92,7 @@ public static function fromGlobals(
             $server,
             $files,
             marshalUriFromSapi($server, $headers),
-            array_key_exists('REQUEST_METHOD', $server) ? $server['REQUEST_METHOD'] : 'GET',
+            marshalMethodFromSapi($server),
             'php://input',
             $headers,
             $cookies ?: $_COOKIE,

src/functions/marshal_method_from_sapi.php

@@ -0,0 +1,19 @@
+<?php
+/**
+ * @see       https://github.com/zendframework/zend-diactoros for the canonical source repository
+ * @copyright Copyright (c) 2018 Zend Technologies USA Inc. (https://www.zend.com)
+ * @license   https://github.com/zendframework/zend-diactoros/blob/master/LICENSE.md New BSD License
+ */
+
+namespace Zend\Diactoros;
+
+/**
+ * Retrieve the request method from the SAPI parameters.
+ *
+ * @param array $server
+ * @return string
+ */
+function marshalMethodFromSapi(array $server)
+{
+    return isset($server['REQUEST_METHOD']) ? $server['REQUEST_METHOD'] : 'GET';
+}