Respect file_uploads ini setting

Author: clue

README.md

@@ -797,8 +797,11 @@ new RequestBodyParserMiddleware(8 * 1024 * 1024); // 8 MiB limit per file
 ```
 
 By default, this middleware respects the
+[`file_uploads`](http://php.net/manual/en/ini.core.php#ini.file-uploads)
+(default `1`) and
 [`max_file_uploads`](http://php.net/manual/en/ini.core.php#ini.max-file-uploads)
-(default `20`) ini setting.
+(default `20`) ini settings.
+These settings control if any and how many files can be uploaded in a single request.
 If you upload more files in a single request, additional files will be ignored
 and the `getUploadedFiles()` method returns a truncated array.
 Note that upload fields left blank on submission do not count towards this limit.

src/Io/MultipartParser.php

@@ -57,6 +57,8 @@ final class MultipartParser
     /**
      * ini setting "max_file_uploads"
      *
+     * Additionally, setting "file_uploads = off" effectively sets this to zero.
+     *
      * @var int
      */
     private $maxFileUploads;
@@ -81,7 +83,7 @@ public function __construct($uploadMaxFilesize = null, $maxFileUploads = null)
         }
 
         $this->uploadMaxFilesize = $uploadMaxFilesize === null ? $this->iniUploadMaxFilesize() : (int)$uploadMaxFilesize;
-        $this->maxFileUploads = $maxFileUploads === null ? (int)ini_get('max_file_uploads') : (int)$maxFileUploads;
+        $this->maxFileUploads = $maxFileUploads === null ? (ini_get('file_uploads') === '' ? 0 : (int)ini_get('max_file_uploads')) : (int)$maxFileUploads;
     }
 
     public function parse(ServerRequestInterface $request)