Add check for empty string to stream factories

Author: sagikazarmark

CHANGELOG.md

@@ -3,6 +3,10 @@
 
 ## Unreleased
 
+## Added
+
+- Check for empty string in Stream factories
+
 ## Fixed
 
  - FilteredStream::getSize returns null because the contents size is unknown.

src/StreamFactory/DiactorosStreamFactory.php

@@ -24,7 +24,7 @@ public function createStream($body = null)
             } else {
                 $stream = new Stream('php://memory', 'rw');
 
-                if (null !== $body) {
+                if (null !== $body || '' !== $body) {
                     $stream->write((string) $body);
                 }
 

src/StreamFactory/SlimStreamFactory.php

@@ -28,7 +28,7 @@ public function createStream($body = null)
             $resource = fopen('php://memory', 'r+');
             $stream = new Stream($resource);
 
-            if (null !== $body) {
+            if (null !== $body || '' !== $body) {
                 $stream->write((string) $body);
             }
         }